Design Icon: 8 Buildings by Hans Hollein

A brilliant green granite and glass creation that had an abrupt debut, considering its location in the city’s St. Stephens Square, the Hass House actually had a historic pedigree (the outside mirrors the corner of an old Roman fortification). While Hollein was initially criticized—"I get anonymous letters saying I should jump off the top of the Haas Haus," he said in an interview—the building has since been recognized for introducing a modern aesthetic to Vienna's downtown.