A daily replay of the experiment that proved the rotation of the Earth.

The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

One of the oldest of its kind.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

This elaborate towering structure was once famed for its revolutionary height.

Yo, Adrian!

The first American department store, and home to the largest operating musical instrument in the world.

Three floors of musical instruments coming from all corners of the world and hundreds of years of musical history.

A little sculpture with a large wardrobe.

From Tintin to the Smurfs, Europe's greatest graphic icons are celebrated in a grand Art Noveau gallery.

Cozy basement bar sports an inventory of over 2,000 beers.

Golden cobblestones remember a time when this small alley was used to avoid having to give a Nazi salute.

Among the ostentatious rococo ornamentation of this church, an image of death cuts the life-thread.

A small but immensely extravagant palace built by the "Night King."

The fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”

Metro station with a claim to rock n' roll fame.

Gardens representing parts of Asia, Europe, and the Mid East are tucked away among the Soviet-style buildings in East Berlin.

A museum dedicated to a Cold War era sausage.

Super-heavy Nazi architectural experiment.

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

These bronze pamphlets remember a remarkable group of Germans who fearlessly opposed the Nazis in the very center of their power.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

The patron saint of spinsters grasps a container of dried blood.

Cold war icon and onetime "hole" in the iron curtain.