Elevation is often framed as progress, lifting movement above the friction of the city and smoothing circulation into uninterrupted flow. Every act of lifting produces a secondary condition in its wake. Beneath flyovers, metro lines, and railway viaducts, a second ground emerges as shaded, ambiguous, and rarely planned with the same intent as what moves above. These spaces are not incidental leftovers. They are the spatial consequence of a design decision that privileges speed, clearance, and efficiency, redistributing value and visibility across the city in the process.
What lies below is not empty. It is structured, constrained, and defined by infrastructure, left without a clear role. Studies on elevated highways consistently describe these undercroft zones as residual spaces, formed when transport systems are conceived independently of the ground they pass through. An Arup report on spaces beneath viaducts notes how they often disrupt pedestrian continuity while remaining outside formal planning frameworks. Similarly, recent academic reviews of under-flyover environments highlight that these areas are rarely integrated into urban design strategies at all. The result is a peculiar condition: space that is physically present and structurally determined, but programmatically undefined.
In 2012, Cities Without Ground: A Hong Kong Guidebook offered one of the clearest documentations of a condition that many residents experience intuitively but rarely name: Hong Kong's dependence on elevated, second-storey urbanism. Through drawings and careful mapping, the book captured how the city's pedestrian networks are routinely lifted above the street—separating people from traffic, extending commercial frontage beyond ground level, and negotiating a hilly topography where "flat" circulation is often an engineered achievement. Since its publication, these systems have only grown in prominence—not only for their sheer spatial complexity, but for the way they recast public space as something continuous yet selective, connective yet curated.
This fascination, however, has always carried a parallel unease. Elevated passages can be generous and effective, offering sheltered movement and reliable connectivity. Yet they also raise persistent questions: where do these routes lead, who gets to connect, and what kinds of programs are invited—or excluded—by this "privileged" level of circulation? The second-storey city does not simply bypass vehicles; it can also bypass the street as a civic stage. Over time, it risks shifting architectural attention away from ground-level public life, relieving designers from having to negotiate pedestrian scale, frontage, and the messy reciprocity of the street. In its worst moments, the result is a landscape of podium clusters and sealed megastructures—buildings that perform connectivity at Level 2 while remaining indifferent to the neighborhood at Level 0.
What do lightweight materials bring to public space with an ethical, ecological, and non-extractive design principle? Various textile textures offer a point of entry, being closer to the body than heavy conventional structural materials. Through its flexibility and responsiveness, it enables a form of soft enclosure rather than a fixed boundary in architectural space. Responding to minimal environmental stimuli, the fabric brings continuous movements into space. When layered or assembled, it produces gradations of density, depth, and enclosure, while recent innovative fabrication technologies extend the possibilities of its form and structural durability.
Semi-transparent materials further mediate the conditions of visual permeability and bodily experience of the space. By transmitting and filtering light, they blur clear separations between interior and exterior, solid and void, creating thresholds that are neither fully open nor fully enclosed, but constantly in negotiation. Reinterpreting structure in urban space through lightweight, translucency, and softness opens up alternative modes of spatial perception and bodily engagement.
Architecture has long been drawn to the idea of lightness. From early modernist experiments that sought to preserve landscapes, elevating buildings has been understood as a way to preserve the ground while maintaining continuity across the terrain. Volumes are lifted on columns, infrastructures detach circulation from the surface, and entire programs are suspended above the ground.
This was formalised in the early twentieth century through Le Corbusier's concept of the pilotis, which proposed the liberation of the ground floor from enclosure. By raising buildings on columns, architects sought to maintain continuity with the terrain, allowing movement, vegetation, and collective use to unfold beneath constructed volumes. The building would occupy the air, while the ground would remain open, accessible, and shared.
In recent decades, cities across the world have seen an increase in the demolition of elevated concrete freeways. Taipei, Seoul, Portland, and Boston, for example, have all seen the rise and fall of these infrastructures to give way to parks and new urban regeneration ideas. In other cases, like Montreal in Canada, some people opposed the freeways even before they were built, effectively rerouting viaducts, preserving heritage, and freeing waterfront views. For San Francisco, in the United States, the story of the Embarcadero Freeway is one of those narratives that serves as a case study of the city's mid-century infrastructural ambition, people's reaction to the project, and its eventual reversal in favor of urban connectivity.
Paris's 19th arrondissement Parc de la Villette is undergoing a major transformation, combining a newly opened urban farm with restored biodiversity as part of a strategy to adapt the 55.5-hectare park to climate change. Masterplanned by Bernard Tschumi in 1982 and opened to the public in 1987, the park stands as a landmark of European modernism in public space design, breaking from the traditional concept of the metropolitan park. With a 15,000-square-meter extension, this major green lung in northeast Paris is reimagining its lawns as a living laboratory for environmental education, where animals, plants, and humans coexist. The extensive renovation follows the addition of Tschumi's HyperTent in 2022, a hyperbolic paraboloid structure functioning as a new ticket booth on the podium of Folie L4, and marks the park's most significant transformation since its inauguration.
Cultural centers continue to serve as a productive ground for unbuilt architectural exploration, reflecting how architects are rethinking the role of public institutions in relation to landscape, experience, and program hybridity. In this Unbuilt edition, submitted by the ArchDaily community, the selected projects bring together a range of proposals that expand the definition of the cultural center beyond a singular building. These works position architecture as a spatial framework that mediates between research, exhibition, retreat, and public life, often embedded within or distributed across natural and urban contexts.
Across varied geographies, from northern Norway and Oslo to Łódź, Vienna, Marrakech, and New Tashkent, the projects demonstrate diverse responses to cultural infrastructure. They include landscape-integrated complexes shaped by topography and climate, bridges that combine gallery and public circulation, zoological pavilions structured as immersive sequences, adaptive reuse of military buildings into performance spaces, courtyard-based environments rooted in local traditions, and climate-responsive institutions informed by environmental analysis. Together, these proposals explore how cultural programs can be organized through movement, spatial layering, and relationships between interior and exterior conditions.
Death is a certainty, but its architecture has never been stable. Every period and culture has invented a different way of placing the dead in the world (close or far, visible or screened, monumental or almost anonymous), and those choices have always carried social and political weight. Cemeteries are where that weight becomes legible in space, turning belief and regulation into boundaries, paths, and names.
In that sense, a cemetery behaves like a piece of city-making. It needs access, limits, and an internal order that can grow without losing clarity. It depends on ground and water management as much as on symbolism, and on administration as much as on form. But its real architectural problem is how to make a large, evolving territory readable while preserving the intimacy of a visit. Names must be locatable; routes must remain legible; trees grow, paths shift, stones weather, records accumulate. What looks fixed is, in practice, a living system designed to be used and revisited, long after the first grief has passed.
This week has been marked by the deliberate, rampant, and unjust destruction of war in Southeast Asia. As one of the most damaging manifestations of human abuse of power, we have witnessed the destruction of places that hold memories and sustain culture, as well as the loss and irreparable harm to the human lives that lend them their identity. With the expectation of offering brighter and more constructive scenarios in the future, we present, in contrast to this reality, a scenario of progress in the gender gap that characterizes architecture and its paths forward, a group of landmark projects of public and community interest moving forward from Türkiye to Mexico, and three major multimodal transport infrastructure projects improving the way we circulate and inhabit public space in Europe and the United States.
Urban masterplans remain an exploratory ground for unbuilt speculation, offering insight into how cities might recalibrate mobility, ecology, and collective life in response to accelerating environmental and social pressures. In this Unbuilt edition, submitted by the ArchDaily community, the selected projects bring together a range of large-scale proposals that examine urban centers, waterfront districts, infrastructural corridors, and cultural landscapes as spatial frameworks for reconnection and resilience. Rather than treating the masterplan as a rigid blueprint, these projects approach urbanism as an adaptive system shaped by climate, topography, infrastructure, and public space.
Across varied geographies, from Northern European town centers and Mediterranean coastal districts to Central Asian polycentric hubs and Gulf megacities, the proposals explore diverse architectural and urban strategies. They range from park-led civic transformations built over highway tunnels to elevated pedestrian networks above active transport systems, mixed-use blocks structured by historic planning logics, marina developments integrating environmental stewardship, and research-driven models for equitable landscape urbanization.
Architecture is often evaluated through finished forms, yet some practices operate in a different register, one where design unfolds through relationships, time, and use rather than through a single outcome. For CatalyticAction, participation is not a parallel social activity, but the means through which spaces are conceived, constructed, and sustained over time.
Based between Beirut and London, the practice has worked across the Middle East and Europe, developing public spaces, schools, playgrounds, and everyday urban infrastructures through long-term collaboration with local communities. Grounded in participatory research and collective decision-making, this approach was recognized through ArchDaily's 2025 Next Practices Awards, highlighting a mode of practice where architecture is understood as a shared, evolving process rather than a fixed object. In this context, architectural value is measured through continuity, use, and collective ownership, rather than through form alone.
Concéntrico is an urban innovation laboratory that invites reflection on the city through architecture and design. Since 2015, it has carried out more than 180 interventions in Logroño, Spain. The new 2025/2026 season of the festival expands on this experimental spirit with three international calls for proposals that bring the ideas in the book Concéntrico: Laboratorio de Innovación Urbana (Park Books, 2025) into action. Through these calls, the organization seeks to explore further three lines of research, the ephemeral, the ecological, and the symbolic, to imagine different ways of inhabiting the city. The winning projects from this edition's calls for entries will be developed, built as urban installations, and presented in the exhibition during the festival, taking place in Logroño from June 18–23, 2026.
Cities around the world share a common goal: to become healthier and greener, supported by civic infrastructure that restores ecosystems and strengthens public life. The question is how to reach this. Global climate targets, local building codes, and municipal standards increasingly guide designers and planners toward better choices. Still, many cities struggle to translate these frameworks into everyday, street-level comfort and long-term ecological protection. What happens if the city is no longer treated as a traditional city, but as a national park?
National parks operate through systems of protection that treat land as a network of ecological relationships rather than a collection of isolated sites. They establish a shared baseline for what must be preserved, maintained, and made accessible over time. When this logic is applied to the urban environment, success can inspire pride and a sense of shared responsibility among designers, policymakers, and residents, fostering a collective commitment to health, habitat, and civic infrastructure.
Sunset panorama of a large residential gated community (Aparna’s Elixir) viewed from Khajaguda hills, India. Photo by iMahesh. License Creative Commons Attribution-Share Alike 4.0 International
You learn how to behave long before you arrive home. At the gate, you slow down and wait. You are watched, then waved through. A badge is checked, a barrier lifts, a camera blinks. Nothing dramatic happens, and that is precisely the point. The most consequential work of gated communities is not done by their walls, but by the choreography of entry that quietly teaches residents what to expect, whom to trust, and where they belong.
Bazaar in Hyderabad, India. Photo by Kanishq Kancharla on Unsplash
Architecture is most often represented as a stable object: a building captured at a moment of visual clarity, isolated from surrounding contingencies. Plans, sections, and photographs promise legibility by suspending time. Yet many of the world's most enduring public environments resist this mode of representation altogether. They are not designed to be read instantaneously, nor do they reveal their logic through form alone. Their spatial intelligence emerges gradually, through repetition, occupation, and duration.
The bazaar belongs firmly within this category. It cannot be understood through a single drawing or a finished elevation. Its organization is not fixed but rehearsed. What sustains it is not purely architectural composition, but shared timing, collective memory, and long-standing patterns of use. Togetherness in the bazaar does not arise from formal design decisions; it is produced through repeated encounters, negotiated proximities, and social familiarity accumulated over time.
Reflecting on the modern city, Walter Benjamin described the flâneur, a figure who walks without a defined destination, attentive to details, chance encounters, and the narratives that emerge from urban space. This way of being in the city, shaped by observation and openness to the unexpected, has long been in tension with the rationalist and functionalist ideals that came to guide urban planning throughout the twentieth century. Streets designed primarily for efficiency and flow rarely leave room for detours, pauses, or the coexistence of different rhythms of life.
Jane Jacobs was also one of the voices that challenged this predominantly rationalist logic, arguing that truly vibrant streets are those capable of sustaining the diversity of everyday life, its informal exchanges, and the forms of care and natural surveillance that emerge from them. What these authors share is a fundamental insight: streets are not merely infrastructures for circulation, but social ecosystems, shaped by the relationships, uses, and encounters that take place within them.
