Belvedere 21

This guide to Belvedere 21 in Vienna follows architect Karl Schwanzer's glass pavilion from its start as Austria's 1958 World's Fair showroom in Brussels, a floating forty-by-forty-meter box on four slender buttresses that won the fair's top architecture prize. You'll hear why Schwanzer shipped the whole thing home to Vienna rather than let it be scrapped, its years as the Museum of the Twentieth Century, and the long stretch it spent dark as a storeroom. It ends with his own former student bringing the building back.