De Young Museum

Perforated copper plates of the De Young Museum, San Francisco

The designers Herzog & de Meuron also did the Birds Nest stadium for Beijing. Because of San Francisco's coziness to a fault line, the building was designed to be able to shift almost a metre on ball-bearing sliding plates. Apparently, the Getty Museum in LA (and others) uses a similar technique:

The bottom layer is bolted to the floor, and the upper layers move horizontally on ball bearings in different directions — east-west and north-south — while springs keep them from sliding too far.

Neat stuff.