Of note is the Haus am Checkpoint Charlie, a museum dedicated to what was the best-known crossing point between East and West Berlin. Checkpoint Charlie was the name given by Western Allies to the crossing during the Cold War (1947-1991) and it was here that Soviet and American tanks came face-to-face during the Berlin Crisis of 1961. The museum contains artifacts and exhibits tracing the history of human rights in Berlin, as well as documentation of escape attempts, including cars, chair lifts and hot-air balloons. The guard house that once stood at Checkpoint Charlie is now on display in the open-air Allied Museum in Berlin-Zehlendorf.