A golden temple atop a sacred mountain, known for its giant effigy of the revered Pu Xian.

Enormous burial mounds of ancient emperors.

Thousands of Mexican Free-Tailed Bats soar around an abandoned storm drain at sunset each summer.

An unfinished rail tunnel that has since been used to house cheese and bats.

A massive cave complex boasts some of the clearest water (and most charming bats) in the world.

Dramatic sea stacks adorn the coast of this small village on the Adriatic coast.

Wander through the Corridor of Wonders in these stunning limestone caverns.

The ruins of an abbey believed to have been founded by Charlemagne in the 9th century.

The second-highest village in Lazio has attracted artists for 400 years and is now a spectacular open-air art gallery.

A magnificent waterfall is also home to the remains of a Roman hydraulic engineering system.

This monastery set over a holy cave contains the oldest known painting of Saint Francis of Assisi.

Explore the dark underground corridors of this graffiti-covered former military fortification.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

Beneath the impressive baroque cathedral that rises from the center of Berlin lies the largest collection of Prussian royals in the world.

The most visited, and possibly most controversial, museum in Germany.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

A monument to the man who almost killed Hitler.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

This parking garage was the site of what was - at the time - the largest cash robbery in history.

The oldest working bell set in North America, the bells at Old North Church sat silent for their first four years in Massachusetts.

The site where Charles Dickens gave his first public reading of "A Christmas Carol" in the US.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

This massive tea kettle was once a promotional stunt for the Oriental Teashop.

Ice cream stand, snack bar, and time capsule of milk conveyance.