"X" marks the spot of an echo chamber in the middle of a plaza.

This kitschy tavern is also home to rare early editions of "Treasure Island."

This colorful but controversial ceiling has been likened to a 21st-century Sistine Chapel.

Ruins of a Carnegie family mansion on Cumberland Island.

The best place for scenic views of the DMZ and North Korea.

A geological mystery on Camelback Mountain.

Las Vegas's very own 40-foot-tall fire-spewing praying mantis.

The only subterranean ping pong table in Atlanta.

The statues commemorate the legendary mass killing of escaped circus monkeys.

Two Civil War-era cemeteries stuck between runways at the world's busiest airport.

The picturesque southern city served as the zombie-filled town of Woodbury in 'The Walking Dead.'

A provocative museum dedicated to the genre and the harsh realities that inspired its origins.

Like Mars, but much closer.

The ruins of a cotton mill that was burned in the Civil War are still hidden in a Georgia forest.

The world's largest private aircraft collection.

Electrical pylon in the shape of Disney's beloved mouse.

Secret gardens just a few miles from downtown Atlanta.

Deep in the Guatemalan jungle stands an ancient pyramid that once marked the reign of a king.

The largest puppetry museum in the United States houses the world's most complete collection of Jim Henson artifacts.

Drink your espresso at a Victorian-era urinal in this underground-restroom-turned-coffee-bar.

This Nigerian nature reserve is home to the longest canopy walkway in Africa.

One of corporate America's best-kept secrets is also one of the most publicly displayed.

J.R.R Tolkien, C.S. Lewis, and other "Inklings" met at the Oxford pub to discuss the now legendary fantasy stories they were writing.

The names Lúthien and Beren can be found inscribed on the shared grave of the famous writer and his beloved wife and muse.