The strange cuboid building in Vienna's fashionable Museumsquartier contains the most-visited museum in the city. The Leopold Museum has a remarkable collection of Viennese Art Nouveau, the Vienna Workshop, and of the Expressionist period. It also has the largest Egon Schiele collection in the world - plus masterpieces by Gustav Klimt.
There are also revolving exhibitions and a great shop and cafe (with a great view overlooking the Museumsquartier).