Government testing at the asylum briefly explored using marijuana as a "truth serum" on Nazi prisoners of war.

People escaping slavery may have hidden inside a corpse vault.

The national park was once a plantation estate.

These recently uncovered walls are all that's left of Washington, D.C's first defense contractor.

The site of the climactic scene from the classic horror film is now a historic landmark.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

This recreation of a 19th-century dime museum is full of oddities.

Visitors to Salt Springs State Park are encouraged to literally put their two cents in Penny Rock.

A sacred collection of indigenous rock art.

Where America's first doomsday cult awaited the end of the world.

Home of the only civilian casualty at the Battle of Gettysburg.

A toxic ghost town sitting atop a massive coal fire.

A museum dedicated to the legend of Bigfoot in the Appalachian Mountains.

Built in the 1850s, this church was of the first five churches constructed in Harper's Ferry.

Spectacular mineral formations fill these caves, which have been used for everything from smoking meat to stashing illicit liquor.

The largest burial mound in the United States holds the remains of prehistoric West Virginians.

Berkeley Hot Springs presents to you "the only outdoor monument to presidential bathing."

Home of a 28-foot tall stalagmite known as the War Club.

A historic coal mine that doubles as a museum and tourist attraction.

One of the few surviving examples of the first lock and dam system built on the Ohio River.

These rows of World War II-era bunkers were the scene of some of the infamous Mothman sightings.

Despite its lavish ornamentation, and wholesome lifestyle of its devotees, this mountain commune has faced its share of issues.

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

This abandoned dream castle and its cemetery look out over the city that once inspired their creation.