The Lenbachhaus Kunstbau in Munich features an exhibition about "Marcel Duchamps in Munich 1912" until July 15th, 2012. The show marks the 100th anniversary of the artists stay in Munich.
"Marcel Duchamp (28 July 1887-2 October 1968) changed art history. His painting “Nude, Descending a Staircase, No. 2” (1912) captured the ideas and influences of a whole epoch in one iconic image. His readymades fundamentally altered our ideas of what art is, of how artists produce it, and of the institution of the museum."
If you have a chance, go!