Perhaps no museum has done so much for the popularity of contemporary art as London’s Tate Modern. Open for only five years, the museum has racked up an astonishing 22 million visitors, far outdistancing its peers on the international art scene. “Of course, not charging for admission helps, but it has offered more than sensational architecture. And as a result, the Tate has changed the way that Britain sees art, and the way the world sees Britain.”