The new 68,000-square-foot Salvador Dali museum in St. Petersburg, Fla., is a cast-in-place, three-story concrete box with 18-inch-thick walls designed to withstand high-force winds. The museum balances its utilitarian exterior with a whimsical glass structure that clings to the outside and houses a single-helix concrete spiral staircase. "It's a giant concrete spring," says Scott Martin, one of the structural engineers who worked on the project.

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