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This article was originally published on January 2, 2015. To read the stories behind other celebrated architecture projects, visit our AD Classics section.

At the Expo ’98 Portuguese National Pavilion, structure and architectural form work in graceful harmony. Situated at the mouth of the Tagus River in Lisbon, Portugal, the heart of the design is an enormous and impossibly thin concrete canopy, draped effortlessly between two mighty porticoes and framing a commanding view of the water. The simple, gestural move is both weightless and mighty, a bold architectural solution to the common problem of the covered public plaza. Under the graceful touch of Álvaro Siza Vieira, physics and physical form theatrically engage one another, and simplicity and clarity elevate the pavilion to the height of modern sophistication.

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