The legendary cliffside castle of three-time Voivode of Wallachia, Vlad the Impaler.

A church of bones, decorated with 40,000 human skeletons.

Their motto is, "We've been bonkers for hats even longer than you have!"

A clear blue swimming hole with hidden caves, still unexplored.

Very likely the only museum in the world that celebrates the glory of the humble banjo.

An immersive art experience built by local arts collaborative, Factory Obscura, in the building formerly known as The Womb, a psychedelic arts center founded by the frontman of the Flaming Lips.

Millions of glowing microscopic organisms light up the waters of this luminous lagoon.

Nature took her revenge on the "Wickedest City in the World."

A set of ancient drawings in the desert of Peru that are so massive, many of them can only be fully seen from the sky.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

The central mosque of this Mali town is entirely built from mud.

The most famous location in China was home to whole dynasties worth of imperial rulers.

A bizarre collection of gifts to North Korean dictator Kim Jong Il from the despots of the world.

A giant bronze monument to Kim Il-sung and Kim Jong-il is one of the most sacred sites in North Korea.

North Korea's massive "hotel of doom."

This abandoned-looking amusement park is frighteningly open for business.

An ancient city exhumed from the depths of the ocean.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

Where thousands of slaves passed through the "Door of No Return."

A focal point of the Cuban government, this city square features one of the most iconic images in the country.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

The "Fun Spot of the Desert" is now a haunting ruin, and a reminder that putting a water park in a desert is a bad idea.

A giant donut stands as a popular symbol of Los Angeles iconography.

The island of Lanai in Hawai'i is a paradise for cats and cat lovers.