The only tennis court that falls under the jurisdiction of the central bank.

An overlooked memorial honoring the local Washington residents who died in World War I.

Art deco landmark on the outskirts of Washington, D.C.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

In the basement of the U.S. Capitol Building is a hidden storage room full of ornate floor tiles leftover from the 1850s.

The towering figures were created from the cemetery's fallen old-growth trees.

A historic arena where the Beatles played their first concert in the U.S.

An intricately designed junk art house with four extravagant junk art cars hidden in the suburbs.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

The world's oldest continuously operating airport was founded by the Wright Brothers.

A small 19th-century graveyard tucked away in the middle of a suburban neighborhood.

Meet some of the most prominent figures in Black history through life-sized wax models.

A model home in the Medical Examiner's Office in which grisly death scenes are staged to train forensic investigators.

A relic of FDR's brief foray into utopian urban planning.

Fiji mermaids, mummified remains, and recreated cryptids are among the morbid oddities at this Maryland museum.

This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

In 1787, a group of delegates met at this very spot to drink, be merry, and ratify the Constitution of the United States.

The elevator hidden in a smokestack on Roosevelt's yacht now serves as a monument to the former president.

Where a staggering 747 ships were constructed during World War II.

The former Naval shipyard is open for exploring - mostly.

An abandoned Cold War missile radar site.

The perfect spot for a picnic, right next to a giant ballistic missile.

This historic Idaho island is home to a strange timeshare museum, a homemade mini-golf course, and an outhouse named Aunt Fanny.

A nearly abandoned 19th-century town on the Palouse.