A model of a galactic embassy is hidden in plain sight along the highway, proposed by a UFO religion to find the aliens that created life on Earth.

These picturesque Hawaiian falls are home to a rare species of fish that uses a special sucker to climb up cliffs.

These abandoned waterworks are crumbling into the Potomac River.

Before Metro, Washington had a robust streetcar network—and you see the remains of this infrastructure if you know where to look.

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

Washington's top-secret Cold War-era doomsday communications tower is located in a small neighborhood park.

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

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

An overlooked oasis of quiet on the grounds of Washington's monumental basilica.

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

The hidden offices underneath Memorial Bridge have been locked up since 1976.

The only known Futuro house in North Carolina sits along a stretch of desolate highway on the Outer Banks.  .

The 44,000-ton aircraft carrier was purposely sunk to create an artificial reef teeming with life.