A sudden, striking cluster of hills south of Padua has been attracting visitors for centuries.

In this nearly 1,000-year-old monastery, monks painstakingly restore old books.

This massive subterranean fissure is known as the "underground Grand Canyon."

An abandoned 19th-century iron factory perched along the outskirts of an idyllic village.

This region of Slovakia boasts some of the most plentiful opal mines in the world.

An unusual cave filled with rare alien-looking aragonite formations.

This spaceship sculpture in the middle of the Slovakian capital looks like it just crash-landed.

Inside the Šomoška National Nature Reserve exists a unique rock formation rarely seen in the world.

The blood-soaked ruins of the castle where the murderous Blood Countess was walled in alive.

This charming wooden church was disassembled and moved not once but twice before settling in this Prague garden.

Towering sandstone rock formations where 'The Chronicles of Narnia' was filmed.

Art Nouveau painter Alphonse Mucha spent 18 years creating these monumental paintings of Slavic history and mythology.

One of the oldest, well-preserved water treatment facilities in all of Europe.

Tall columns of volcanic basalt make up this improbable-seeming rock formation.

Underneath the city that invented pilsners are a series of historic tunnels that have been storing beer for centuries.

This unusually shaped mountaintop tower looks like a UFO floating over the city.

The world's greatest slide descends 18 stories from this looping mountaintop viewing platform.

Bohemian paradise covered in majestic forests.

Europe's largest natural bridge has a 19th century royal chateau built into its side.

Thirty creepy ghosts now inhabit this decaying 14th-century church.

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

Buried five stories underground, this Soviet bunker is packed with gas masks and Cold War paraphernalia.

This network of conjoined cellars was riddled with traps and supposedly allowed the townspeople to pretend their homes were deserted.

The mystery of the Putim Ossuary involves a tricorn hat.