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

Underneath this small church are 15,000 bones, arranged by an obsessive academic.

A steampunk-styled three-floor factory churning out art, activism, and electronic beats.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

This Czech church doubles as something of a permanent fashion exhibition for a statue of the Infant Jesus.

The oldest garden in Prague, once part of an medieval orchard.

An eerie, existential museum dedicated to the author of "The Metamorphosis."

Walk through Czech history in Prague's largest graveyard.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Macabre astrological automaton clock dating to the late 1400s.

A collection of anatomical samples from one of the first anthropologists to suggest that humans reached North America by crossing the Bering Strait.

Street artists transformed an abandoned air vent into the beloved Star Wars robot.

This uber-quaint Polish village is known for its habit of painting elaborate floral motifs on just about everything.

An underground city of salt.

There are thousands of tributes and memorials to the King, but none quite like this one in a Kraków city park.

A memorial to the beloved brown bear that served in the Polish army during World War II.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

Few of the many visitors to this resort town know of its hidden Maya ruins.

One of Mexico's least-visited archaeological sites is tucked away inside a theme park.

A unique collection of diving equipment spanning antiquity to the present day.

This 140-year-old beacon off the Florida Keys marks the wreck of a Navy ship that once roamed the Caribbean hunting pirates.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

Island ghost town detailing Flagler's folly in building the Overseas Railroad.

The largest freshwater lake in the Florida Keys.