This nondescript building hides an entrance to an underground nuclear tunnel system.

German and American troops joined forces to defend this fortress during the strangest battle of World War II.

This Cape Cod museum exhibits what it claims is the only authenticated pirate treasure in the world.

This enchanting natural park is a magical example of a temperate rainforest in Europe.

This quirky museum has a collection of more than 15,000 bobblehead dolls.

When the USA donated cement and funds to expand the airport in Laos, the Laotians built a massive monument instead.

It's rumored this unique Baltic beacon was designed by Gustave Eiffel himself.

The beloved war-time celebrity spent time in the area before retiring to the Edinburgh Zoo.

With former lives as a bomb shelter and government parking lot, this shop is one of China’s most extraordinary locales for book-lovers.

When the rain falls, this drain system turns into a musical instrument.

A tiny chapel perched along a 14th-century bridge.

A cluster of historic bathhouses built on the famed hot springs that gave the Georgian capital its name.

This neolithic stone grave has been altered and restored so often its now more neo than lithic.

A university observatory dome painted to resemble the beloved 'Star Wars' droid.

A retired firefighter created this contraption so he and his family wouldn't die if accidentally buried alive.

The sculpture of the deceased cockatoo flops atop its personal plinth.

"We gonna rock down to Electric Avenue, and then we'll take it higher..."

This medieval sanctuary's tree-framed door looks like a portal to a mythical realm.

This cave system allegedly holds the "metallic library" of a lost ancient civilization.

A spooky juxtaposition of caves and graves gives this legend-filled cemetery a particularly haunting vibe.

An Ethiopian cloud forest protects some of the last wild arabica plants.

In Texas, a replica Irish castle is home to a charismatic pack of llamas.

This stunning, out-of-the-way Croatian monument commemorates a community's uprising against occupying fascist forces.

Florida’s half-sized replica of the Vietnam Veterans Wall.