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

The mystery of the Putim Ossuary involves a tricorn hat.

Mummified monks and the accidentally interred, in a 17th-century crypt.

Looming communist pillar with a Czech twist.

Macabre astrological automaton clock dating to the late 1400s.

The first museum in the world devoted to sexual gadgetry.

This Prague museum collects brutalist relics and memories from the country's former Soviet rule.

The tallest outdoor elevator in Europe rockets passengers on a dizzyingly precarious ride to the top of a mountain.

These spooky and unusual stone formations create an underworldly landscape.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

The industrial monstrosity known as Bagger 258 is a colossal mining machine built in the DDR - but now left for dead in a German field.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

Hungarian mummies in beautiful painted coffins.

Moss and stone turn this waterfall into an otherworldly liquid veil.

Said to be the only museum in the world dedicated to the most classic of all blooms, the rose.

The temple that withstood the Nazis.

This ancient theater, restored in the 20th century, lives on as a venue for dramatic and musical performances.

Rock carving created 1,300 years ago 75 feet off the ground.

A striking symbol of the Bulgarian capital.

An homage to the medieval rulers of Bulgaria.

"Unity, Creativity, Beauty."

Eastern Bloc nostalgia, anybody?

"Holy Wisdom" overlooks the city that became its namesake.

Ruins of an early Roman Christian church dating back to the 4th to 5th centuries.