This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

This legendary city has been a tourist attraction for centuries.

The hallucinogenic center of the ancient world.

A small man-controlled waterfall powers an Art Nouveau elevator and is accessed via narrow gauge, solar-powered tramway.

This tremendous timepiece was once the largest cuckoo clock in the world.

Walk inside a half mile long crevice right outside the town of Garmisch Partenkirchen.

Fantastic views and thousands of love locks.

Legendary site where an evil bishop was devoured by rodents.

A rare water-powered funicular, it uses a huge tank of water and gravity to do its work.

The last bastion of Roman presence north of the Alps looms over a German town.

This Dresden church was purposely rebuilt Protestant after being demolished in World War II.

Cold war icon and onetime "hole" in the iron curtain.

This former steel and coal plant is now a neon-lit industrial fantasia.

Ruins of a German castle on top of a towering stone pillar.

The fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”

The video game-themed street art first popped up in the French city.

A colossal sculptural lion built by the same man who designed the Statue of Liberty.

This structure atop a craggy cliff in one of the most beautiful parks in Paris boasts an unbeatable view.

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

This bridge was constructed from the rubble of the infamous Bastille.

A chapel on a volcanic core, marking the end of a successful journey.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

A Gothic cathedral created from volcanic rocks.

Historic medieval fortified city in southwest France.