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Barcelona is a city where architecture has long served as a laboratory of urban experimentation, each era leaving its mark on the city's fabric. From the dense streets of the Gothic Quarter to the ornate interiors of the Palau de la Música Catalana, the city expanded outward through Ildefons Cerdà's Eixample, a stage where Gaudí and his contemporaries challenged the rules of form, scale, and ornamentation. These experiments defined a local identity and culminated in the Sagrada Família, a vision that continues into the 21st century through the integration of advanced technology.

The city's twentieth-century transformation forged an architectural language with global influence. The principles of International Modernism are embodied in Mies van der Rohe's Barcelona Pavilion, while later developments—from Bofill's explorations in collective housing to the urban interventions of the 1992 Olympics—reshaped the skyline and the city's relationship to its waterfront. Subsequent contemporary projects continue to negotiate form, landscape, and urban scale, contributing to a layered and evolving city.

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Violent cities result from social and economic inequality, which also affects the urban landscape and the way we live. In honor of International Cities Day, we have selected a series of projects to reflect on non-violent ways of using public space.

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