The elevator that makes it possible to fly American flags in bulk over the U.S. Capitol

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

The walls of the iconic dome are hollow and have a secret stairway.

The remnants of a wooden-hulled fleet built and abandoned in WWI, now home to a thriving ecosystem.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

An eerie, decaying ghost town destined to fade into the forest.

A derelict bit of transportation infrastructure hidden in the woods.

A historic cemetery with unique artwork, a Civil War fort, and also happens to be the site of the Battle of Bladensburg.

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.

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

This shop for all your super spy needs hides an educational secret.

Mysterious rocks that ring musically when struck.

A museum dedicated to the history and exploration of both popular music and science fiction.

The seamy, underground secrets of Portland's criminal past.

The only theatre in the world constructed specifically for sound movement.

Venue for strange sideshow displays and musical acts.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

A one-of-a-kind collection of a unique medium.

This New Orleans tree is filled with hidden chimes that produce a carefully tuned melody.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

Just a few miles from downtown Atlanta is a trail covered in a crazy collection of outsider art.

Get lost in this haunting fairytale art walk through a man-made eucalyptus grove.

The United States Capitol's former columns still stand.