A much-maligned monument to teetotalism.

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

At 207 feet, one of the world's longest continuous escalators.

The hippo that stands on this university campus was once a drunken flea market purchase.

There’s a hidden military meme engraved on the World War II Memorial.

The U.S. Fish Commission’s effort to mass produce carp.

A tiny monument to the unsuccessful attempt by Thomas Jefferson to place the prime meridian in Washington.

This 29-ton granite ball spins around at the slightest touch thanks to a scientific phenomenon.

Inspired by a foil-wrapped potato, (seriously) the Markel Building has been deemed one of the 10 ugliest buildings in the world.

The only surviving 19th-century water-powered mill found in the Washington, D.C. area.

This colonial tavern played host to George Washington, Thomas Jefferson, and other famous early Americans.

The narrowest house in America is seven feet of pure spite.

Rat sculptures try to infiltrate the Graybar Building in an architectural tribute to New York City's nautical history.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

Outsider art meets paleontology at this roadside reptile repository.

Two insane asylum bodies embalmed by an amateur.

This former coal gasification plant found a curious second life as a popular public park.

A wall of chewing gum moonlights as collective art.

Spectacular views await visitors to this lake.

Walk in the footsteps of the famed astronaut at Purdue University.

Purdue students would lean over this iron fence to skirt campus rules against smoking and courting.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.