An Orthodox church built by the Royal Family for the Russian community exiled to the French Riviera.

One of the largest ochre quarries in the world, hidden in a limestone landscape.

This ancient theater was once the home of fierce gladiatorial battles.

Hundreds of prehistoric stones, arranged in perfect lines in a French field.

There has been an astronomical clock on this spot since the 14th century.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

The mental institution where Van Gogh created some of his most famous work now allows guests to walk in the artist's footsteps.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

One of the largest squares in Europe contains an entire artificial island.

Numerous stone coffins from different centuries, lined up in a sixth century basilica.

The only visible remains of this ancient Greek underground temple is its roof protruding from the earth.

This high-speed test track is popular with car manufacturers, speed freaks and orbiting astronauts.

Also known as the Temple of Poseidon, this is one of the best-preserved Greek temples in the world.

This curious, round temple is the oldest still-standing marble building in Rome.

A popular legend claims that the famous pizza was invented at a restaurant in this alley.

A mysterious ancient elephant said to possess magic powers is now the symbol of a Sicilian city.

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

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

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

The last masonry skyscraper ever built reveals a transitional moment in architectural history.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

Explore the quarry where the marble was sourced for Michaelangelo's David.

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