Public spaces remain some of the most dynamic sites for unbuilt architectural experimentation, revealing how cities and architects can imagine accessibility, gathering, and civic identity. In this curated Unbuilt edition, submitted by the ArchDaily community, the selected proposals examine parks, pedestrian corridors, cultural landscapes, and open-access urban environments that invite people to meet, move, rest, and participate in collective life. Rather than treating public space as leftover terrain, these projects position it as essential infrastructure—shaping urban health, memory, and social interaction.
Cities bring together the best and worst of the human condition. They concentrate opportunities for work, social networks, and cultural production, but they also expose deep social inequalities. Among the many forms of urban exclusion are limited access to transportation, housing, leisure, or safety issues. One form that is rarely discussed is thermal inequality. In lower-income neighborhoods, where there are fewer trees, parks, and permeable surfaces, heat accumulates and thermal discomfort dominates, resulting in higher energy consumption and health risks. As concern about the climate crisis grows, this discussion becomes more urgent: extreme heat is no longer just a climatic phenomenon but also a spatial expression of inequality.
Infrastructure has long defined the backbone of cities by linking people, landscapes, and economies through systems that often go unnoticed until they fail. Today, as global challenges demand more adaptive and human-centered responses, architects are rethinking what infrastructure can be: not just a framework for movement and utility, but a catalyst for ecological restoration, cultural continuity, and civic imagination. The following unbuilt projects, submitted by the ArchDaily community, explore this expanded role of infrastructure, where airports, bridges, industrial parks, and pedestrian networks become architectural expressions of connection and care.
Immersive Resilience Garden / Changyeob Lee + Studio ReBuild. Image Courtesy of Studio ReBuild
The concrete canyon of Melbourne's Degraves Street was once a stark service corridor in functional obscurity. Today, the narrow laneway now pulses with life beyond its famous café. Native grasses cascade from carefully positioned planters while small shrubs create cooling microclimates. Challenging traditional ecological design models, community-led approaches to biodiversity invite a reimagining of how architects, planners, and communities collaborate to develop biodiverse urban futures.
Titled "Chinampa Veneta", the Mexican exhibition for the 19th International Architecture Exhibition – La Biennale di Venezia seeks to promote reflection on how we inhabit, cultivate, and design the world we share. In the face of the global ecological crisis, the project draws attention to chinampas, an ancient Mesoamerican agricultural system with more than four thousand years of history. This ancestral knowledge, interweaving landscape, infrastructure, and technique, is reimagined in the context of the Biennale, activating a living environment within the city of Venice. The Mexican Pavilion consists of two "enactments," one located in the Arsenale and the other built on water.
Kampung Admiralty / Ramboll Studio Dreiseitl + WOHA. Image Courtesy of WOHA
Ebenezer Howard's verdant visions for cities have spread eastwards, far beyond his British roots. In the 1900s, city planning welcomed the Garden City Movement as a champion of good design - a response to Western industrial urbanization. Soon, Asian cities conceived their archetypes, juggling local constraints in climate and density. Designs and development, from colonial-era experiments to contemporary mega-projects, have embraced and reinvented Howard's vision well into the 21st century.
In the United States, nearly 1 in 10 children are affected with asthma, a condition with rates significantly higher in urban areas of the country. However, in a community just outside Atlanta with a population of more than 300 children, not a single case of the condition has been reported. This is by design. Most cities and neighborhoods across the country are not designed with human biology in mind, an oversight that contributes to the growing prevalence of cardiovascular disease and mental health challenges. Are we treating chronic conditions as purely medical, when they may actually be symptoms of poor design?
Foster + Partners is developing a comprehensive masterplan for Maratué, a 1,045-hectare site located along the Puchuncaví coast in Chile. Developed for Inmobiliaria Maratué, the project seeks to reconnect the existing town of Puchuncaví with its coastal edge, while conserving and enhancing the region's diverse natural landscapes. The masterplan aims to create a sustainable framework for long-term development, balancing residential growth with environmental protection.
Pollinator Garden and Meadow. Image Courtesy of San Antonio Botanical Garden and Reed Hilderbrand
Reed Hilderbrand Landscape Architecture firm has unveiled images of its strategic master plan for Texas' San Antonio Botanical Garden, in the United States. The plan is designed to guide the future of this public landscape, reflecting long-term objectives focused on accessibility, conservation, and horticultural education. The vision includes a new horticultural campus and a public greenhouse for the site, designed by SO-IL, an architectural design firm based in New York whose 450 Warren housing project in Brooklyn was selected by ArchDaily's audience as the Building of the Year 2024 in the Housing category. The master plan aims at a more ecologically sustainable environment while enhancing the visitor experience across the garden's 38-acre landscape.
Woodward Avenue, between the Detroit Institute of Arts and the Detroit Public Library, serves as a public mediating ground on the nation's first paved road.. Image Courtesy of Agence Ter - Akoaki
The Detroit Cultural District has announced an ambitious initiative to reshape its urban landscape. This multi-phased project led by the Detroit Cultural Center Association (DCCA) in partnership with Design Leads Akoaki and Agence Ter, will transform the district's character, creating a more vibrant and accessible environment for residents and visitors alike. The project builds upon a comprehensive master plan, outlining a 15-year vision for the 80-acre campus in Detroit, Michigan. The plan's guiding principles focus on unifying the district's twelve institutions, improving pedestrian flow, and fostering a stronger sense of community.
Women have played a pivotal role in the evolution of landscape architecture, overcoming the constraints of a male-dominated profession to introduce groundbreaking ideas and fresh perspectives. From early pioneers to contemporary leaders, their work has reshaped how we interact with public and private spaces, intertwining aesthetics, functionality, and sustainability in innovative ways.
In the late 19th and early 20th centuries, female landscape architects carved out their place in the profession, emphasizing harmony between built structures and natural landscapes. Their projects showcased a deep commitment to community and ecological balance, setting the stage for an inclusive and thoughtful approach to design that continues to inspire the field today.
Greenways, as a typology of urban design, have become an essential element in the planning of modern cities. They emerge in response to the increasing fragmentation of urban landscapes by elements such as highways. They usually integrate natural and constructed spaces, providing much-needed connections across various parts of the city. At the same time, they promote pedestrian accessibility, recreation, and social interaction. The Rose Kennedy Greenway in downtown Boston, United States, exemplifies this human-centered approach to design. The project, which began construction in 1991, showcases the potential of greenways to reconnect urban environments and enhance community life. As a series of parks designed by various architecture firms, it aims to create physical links and meaningful spaces that foster social development and a sense of place.
Prioritizing people and the planet, when it comes to building construction and real estate development, is being seen as more than an ethical mandate - it is a highly profitable approach. Changing market demands, city ordinances, and regulations, and an emphasis on Environmental, Social, and Governance (ESG) factors are all influencing what successful development in the 21st century stands for.
In Toronto, Canada, the ongoing Downsview Airport redevelopment project showcases this mindset in practice. While traditional development has generally focused on maximizing short-term returns, the Downsview project offers a holistic alternative that can invite significant long-term profits, all while addressing broader societal and environmental concerns.
New York-based office Field Operations, renowned for their work on Seattle's waterfront and New York's High Line, along with Toronto's Brook McIlroy, have been tasked with transforming underutilized lands beneath the Gardiner Expressway in Toronto. The project was launched by The Bentway Conservancy, in partnership with the City of Toronto, and represents the second phase of the development aiming to revitalize underutilized spaces along the expressway. The initiative set out to transform three large traffic islands between Dan Leckie Way and Spadina Avenue into an 11,500-square-meter public space for recreation and community activities.
Architects Belinda Tato and Jose Luis Vallejo of Ecosistema Urbano have designed a plug-in public space designed to address the effects of climate change in ill-equipped urban environments. Titled Polinature, the installation has been funded by the Salata Institute for Climate and Sustainability at Harvard, and is now installed in the backyard of the Harvard Center for Green Buildings and Cities. The pavilion, featuring native plans set into a scaffolding, with an inflatable bioclimatic canopy, aims to demonstrate how small-scale interventions can create compound positive effects for the local micro-climate and biodiversity.
From the 1930s to the 1990s, Burle Marx's work anticipated many of today's concerns about sustainability and urban well-being. Long before terms like "sustainable design" or "green infrastructure" became commonplace, Burle Marx was already advocating for the use of native plants, recognizing their role in creating self-sustaining ecosystems that required minimal intervention. His projects often transformed neglected urban areas into vibrant, ecologically balanced spaces that not only improved the environment but also enhanced the quality of life for city dwellers.
