Formerly a shooting range that was then remodeled by the National Socialists for the '36 Olympic Games, the Hasenheide ("rabbit warren") is one of Berlin's most folksy folk-parks, with sweeping lawns, multiple recreational spaces, and even a small zoo. Here one finds a monument to Friedrich Ludwig Jahn, the founder of the German gymnastic movement; a sixty-nine meter high hill made out of rubble left over from the war; and, at the entrance, a sculpture honoring the "debris women," who were mostly responsible for cleaning up Berlin after the war.