POW!! BAM!! See your favorite superheroes in action at Baltimore’s Geppi’s Entertainment Museum (410/625-7060; geppismuseum.com), comic-book publisher Steve Geppi’s personal toy chest of popular culture. Among the more than 5,000 mechanical banks, cartoon sketches, cereal boxes, and movie posters on display are a 1930’s German windup tin toy of Mickey and Minnie, made before Hitler denounced the enemy mice, and an original of the 1938 Action Comics No. 1 book in which Superman first leapt onto the scene.