If you have a penchant for art in weird places, make the trip out to the Langen Foundation . The location: a former NATO missile base where Pershing tanks armed with nuclear warheads held the line against the Soviet Union during the Cold War. The architecture: a minimalist glass, steel and concrete box by Japanese Meister -architect Tadao Ando. The art: a top collection of Japanese screens, scrolls and sculpture, plus works by 20th-century greats, such as Jawlensky, Klee and Ernst, presented in changing exhibits.