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The World's Largest Cities in 2025 by Population

Every year, World Population Day is observed on July 11th, aiming to increase people's awareness of various population issues, such as the importance of urbanization, gender equality, poverty, health, and human rights. In 2025, under the theme "Empowering Youth to Build the Families They Want," the United Nations draws attention to the largest generation of young people in history, many of whom are coming of age in rapidly urbanizing contexts. Urban centers remain key to understanding these demographic patterns, as cities continue to attract populations seeking opportunity, stability, and access to essential services. Today, more than half of the global population resides in urban areas, a share projected to increase to 66% by 2050.

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The Nubian Vault: Reviving Ancient Techniques for Modern Solutions

The colorful houses of Aswan in the south of modern-day Egypt attract tourists who venture that far up the River Nile. Accessed by small river boats, islands like Suheil West are the homes of Nubian communities, some of whom had had to relocate after the building of the Aswan High Dam in the 1960s. Behind the picturesque views of plastered walls covered in murals and motifs, perched on rocky hills overlooking the Nile, is a construction technique used locally for centuries. It uses locally sourced materials, conserves nature, and regulates internal temperatures against the heat in the day and the cold at night.

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From Martian Hydrospheres to Forest-Like Cities: 6 Radical Urban Visions Unveiled at the Venice 2025 Architecture Biennale

Cities today are being reimagined as living, evolving organisms, combining digital intelligence, ecological systems, and new materials to shape radical futures. At Carlo Ratti's "Intelligens. Natural. Artificial. Collective." biennial, over 750 participants challenge established boundaries between architecture, landscape, and technology. Several conceptual projects showcased in the main exhibition challenge conventional boundaries between architecture, landscape, and technology. From bio-adaptive urban systems and Martian water-based settlements to immersive symphonies of satellite data, these works collectively envision new models for cohabitation, resilience, and planetary awareness.

This month's Unbuilt selection presents six speculative projects, presented as part of the 2025 Venice Architecture Biennale exhibition, as provocations for rethinking the future of cities and human settlement. While some proposals transform architecture into self-sustaining, living infrastructures, others explore how data and sensory interfaces can redefine our relationship with natural and urban environments. Together, they offer a cross-section of how architects and designers are using unbuilt work to imagine new possibilities for life on Earth and beyond.

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Léon Krier, Influential Voice in New Urbanism, Passes Away at 79

Léon Krier, the Luxembourg-born architect and urban theorist renowned for his critical stance against modernist planning and his influential role in the New Urbanism movement, passed away on June 17, 2025, at the age of 79. Known for his uncompromising critique of modernist planning and his vision for human-scaled, walkable communities, Krier leaves behind a substantial body of built work, theoretical writing, and educational influence.

Over a career spanning several decades, Krier advocated for a return to classical architecture and human-scaled urbanism, positioning himself as a leading critic of sprawling suburban development and high-rise modernism. His advocacy for walkable, mixed-use neighborhoods and his insistence on the cultural and social value of architecture challenged the prevailing norms of late 20th-century urban planning.

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Living Together: 8 Conceptual Projects Rethinking Collective Housing in Sites from Tehran to Tirana

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Collective living continues to be a central theme in contemporary housing discourse, one that extends beyond questions of density or typology to engage broader concerns of land use, social cohesion, and spatial identity. This selection of conceptual unbuilt projects, submitted by the ArchDaily community, explores the potentials of shared living environments, not only as functional housing solutions but as frameworks for interaction, environmental integration, and cultural continuity. Whether in urban or remote settings, they reflect a growing interest in rethinking how domestic space can support both individual privacy and communal life.

Seville Architecture City Guide: 21 Projects Tracing the Layers of an Andalusian City

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Located in southern Spain, Seville unfolds as a layered city shaped by centuries of cultural intersections. As the former capital of Al-Andalus and a central port during the Spanish Empire's expansion, its built environment reflects a deep historical complexity. From Roman foundations to Islamic geometries, from Renaissance palaces to contemporary interventions, Seville presents a unique spatial narrative in which architecture directly reflects its political, religious, and social transformations.

The city's architectural heritage is inseparable from its climate and geography. Narrow shaded streets, inner courtyards, and water as spatial elements reveal a deep knowledge of environmental adaptation that still informs how public and private spaces are articulated today. While monumental landmarks such as the Alcázar, the Giralda, or the Cathedral preserve and reinterpret historic legacies, modern projects have begun introducing new materials, programs, and spatial typologies, challenging conventional forms and proposing alternative ways to inhabit the city.

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