A mini Wrigley Field for mini baseball players.

This unique zoo is the only place in the world where you can see all 15 species of crane.

A large circus museum with summer performances.

A remnant of the last Ice Age, this lake is surrounded by fascinating rock formations.

A bizarre house filled with an astounding array of collections.

This beautiful landscape is the only Sichuan-style garden outside of China.

A near tragic event on this bridge helped inspire the classic film "It's a Wonderful Life."

An eclectic assortment of medieval architecture in a small Iowa town.

A hidden barn-sized rendition of Grant Wood's most famous, and most parodied, painting.

Railroad officials in the early 1900s sought to spare travelers the sight of Roman soldiers’ private parts.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

The first memorial dedicated solely to the Black troops who fought for the Union.

There just so happens to be a court even higher than the U.S Supreme Court: a basketball court in the building itself.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

A bas relief commemorates the "Nuns of the Battlefield" who cared for soldiers on both sides of the conflict.

The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

A gorgeous mural outside a beloved D.C. restaurant pays homage to famous Black Americans.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

Washington's iconic carousel has a nice piece of Civil Rights history.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

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

Decades before the scandal, this staircase on the river was a literal "water gate."