Geometry and mystery come together in an epic show of octagonal masonry.

The sunlight passing through the opening of this huge cave system creates a magical effect.

People have been living in the cave houses on this Italian hillside since the Neolithic era.

Three underground crypts and a pointed arch under the bell tower make this cathedral unique among Romanesque churches.

Macabre symbols of death and mummies on display set the tone of this Italian purgatory church.

Southern Italy's spinning top village.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

Italian cave with exceptional acoustics and an unsavory history.

The world's most active stratovolcano is almost always erupting.

A medieval wash house where people washed clothes in a river allegedly formed by the tears of a mourning nymph.

This amazingly preserved Doric temple was abandoned before it was ever completed.

"Stairs of the Turks", a chalky white cliff eroded conveniently into stairs, allowing for easy pillaging.

Every inch of this chapel is covered in craftsmanship from across the world.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

The metal leaves on this tree are engraved with the names of Holocaust victims.

A plaque bearing the names of those who dedicated themselves to protecting Budapest's Jewish population during World War II.

An icy lake tucked among jaw-dropping alpine panoramas.

A unique form of erosion created an uncanny landscape of boulders perched atop slender columns of clay.

An ancient rogue artist community hidden next to one of the world's most glitzy and glamorous cities.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

Ozymandias’ time-keeping temple.