Contemporary architecture has learned to celebrate living matter. Mycelium panels, algae systems, living walls, life is now welcomed into buildings, framed as innovation. Yet the same discipline that celebrates these organisms treats mold as contamination. Both are biological. Both respond to moisture, temperature, and material conditions. The difference is not scientific. It is about which forms of life architecture is willing to accept, and which it prefers to remove.

Mold is not limited to abandoned buildings or poorly maintained interiors. It appears in homes, schools, offices, historic structures, and new construction, across different climates and contexts. This makes it harder to ignore as a minor or isolated problem. If mold keeps returning, what is it telling us about the environments buildings create?

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AD Classics presents you with some of the greatest buildings of the past that have influenced and shaped architecture today. Throughout ArchDaily's 13 years, more than 200 classics were published, and for this edition, we have rounded up the top 20 most visited Architecture Classics to date.

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Text description provided by the architects. After World War II, the need for housing was at an unprecedented high. The Unite d’Habitation in Marseille, France was the first large scale project for the famed architect, Le Corbusier. In 1947, Europe was still feeling the effects of the Second World War, when Le Corbusier was commissioned to design a multi-family residential housing project for the people of Marseille that were dislocated after the bombings on France.

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Le Corbusier was a pioneer of the Modernist Movement in architecture. Throughout his career, he undertook an array of projects all around the world. See below for 17 of his works that have been named World Heritage Sites by UNESCO, as well as many more of his other popular pieces. Hopefully, someday you get to go and see them yourself!

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Walden 7 is a project implementing some of Ricardo Bofill's earliest ambitions and addressing most of the problems of modern city life. It is located on the same lot as Taller de Arquitectura, based in the refurbished ruins of an old cement factory. The housing structure benefits from Bofill's earlier research and the idea of providing public spaces and gardens for residents to enjoy an enhanced quality of living.