People escaping slavery may have hidden inside a corpse vault.

A perfect replica of the beloved show's first set.

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

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

The naval commander’s proudest moment in battle is memorialized in this unique tomb at Arlington Cemetery.

The rogue roots are gradually consuming some of the historic marble grave markers.

Her final resting place was intended to be modest and private, but the power of her popularity continues to draw visitors.

Trace the history of writing at this unusual North Carolina destination.

This small town Texas cemetery is said to be the burial site of a UFO pilot who crashed in the 1800s.

The final resting place of one of the most sensational guitar players of all time was created only after his father got the rights to his music.

Wall to wall taxidermy at Denver's oldest and most exotic steakhouse.

The final resting place of two (or three) presidents, one vampire, and 18,000 Confederate soldiers.

Crumbling hotel echoes with the sounds of the '30s.

Giant busts of 42 U.S. presidents are sitting in a field in Virginia.

Nine of the very few concrete ships ever made in the U.S. are beautifully decaying off a Virginia pier.

The official atomic museum of the United States explores the explosive and productive history of a much maligned energy source.

A recreation of the doomed ocean liner in the middle of the Smoky Mountains.

A collection of oddities including Dr. Kevorkian's suicide device, the Thanatron.

This large midwestern cavern features impressive rock formations and an underground waterfall.

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

America's post-nuclear-attack chambers of Congress.

The childhood home of Henry Jones Jr. is now an adventure-themed bed and breakfast.

The remains of the iconic train crash from the movie The Fugitive can still be found rusting along the Great Smoky Railroad.

Art museum based around the collections accumulated over 58 years by one eccentric thrift store owner.