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

Current docking place of the SS United States, the fastest transatlantic ocean liner.

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

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

Yo, Adrian!

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

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

World's first "penitentiary," meant to be humane, drove men insane.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

Memorials and tributes scattered across the university grounds remember a famous national tragedy of the Nixon era.

Behold the rickety wooden glory of the world's oldest operating roller coaster.

This dramatic rail curve was once the target of a failed Nazi attack.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

A tradition unlike any other, this marks the site of the annual Groundhog's Day tradition.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

One man's real life disfigurement inspired a lasting local legend surrounding an eerie tunnel.

A preserved 18th century homestead in Western Pennsylvania marks the spot where the Whiskey Rebellion began.

An 18th-century Catholic church converted into an eccentric temple of music and bacchanalia.

One of the steepest streets in the United States makes an intriguing challenge for cyclists.

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

A take-out restaurant that only serves cuisine from countries with which the United States is in conflict.

A restored Pittsburgh house of God has been converted to a marvelous house of suds.

The only way to see Pittsburgh is from the top of this lookout point, just like the ancient members of the native peoples did.

The largest clock face in the United States is twice the size of Big Ben and infinitely more ad-sponsored.