A secretive collection featuring objects that were designed specifically for U.S. intelligence operations.

100 years later, they're still down there.

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

The institution is sitting on a goldmine of 21,000 paints, varnishes, pigments, and primers preserved for posterity.

It was once the base for a series of domestic terror attacks.

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

People escaping slavery may have hidden inside a corpse vault.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

Home to items never before seen by the public.

A benevolent, 16-foot-tall river dragon lives on a suburban lawn.

The shelves in the back of this thrift store are devoted to saving, not selling, retro tech.

This Maryland farm is known for its amazing corn mazes and its 30-foot junkbots.

A hidden alley in urban Baltimore is a haven for graffiti artists.

Eighteen miniature death-scene dioramas.

For 150 years one family has been producing the iconic hot sauce on a bayou island made of salt.

This abandoned Civil War fortress is slowly being swallowed by the waters of Lake Borgne.

By day this New Orleans square is for pedestrians, but by night it is a kingdom of kittens.

Imagine playing a version of Legends of the Hidden Temple, but with a distinctly Southern Gothic flare.

This knobby, drooping New Orleans oak is a favorite place both for climbing and for meeting giraffes.

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

A theme park that suffered massive flooding during Katrina was abandoned, and now proves irresistible to trespassing explorers.

The final resting place of New Orleans' most famous voodoo priestess.

An astounding collection of medical specimens, including bits of President Lincoln.