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

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

The only National Monument ever to go missing for nearly 50 years then resurface in a dump.

There's a crumbling old mansion inside the Smithsonian National Zoo.

This poor little statue is the most vandalized memorial in Washington.

Remants of foundations, streets, and streetcar tracks inhabit the cliffs where a landslide occurred in 1929.

Try not to get slimed in Tribeca.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

The ghostly remains of an accidental sea.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

An old vending machine serves up unpredictable beverages from its seemingly magical insides.

You could be standing at the site of one of D.C.'s most fatal tragedies and not even know it.

This sandwich shop has a century-old elevator behind a sheet of plexiglass.

Where the U.S. government kept its actual treasure, before Fort Knox.

The rocks in this arid basin leave trails of movement behind them.

A snapshot of the city's fascinating voodoo culture.

A bizarre house filled with an astounding array of collections.

World's largest collection of serial killer artwork and other macabre exhibits.

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

An obscure public service from the U.S. government that redeems burnt, moldy, and soiled old greenbacks.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

The famous abolitionist’s preserved estate is one of Washington's finest monuments to its great Black citizens.

This leafy estate is worth $18 million and is so grand it has two mailing addresses.

A nostalgic bibliographic gem.