Leonardo da Vinci was one of many to find inspiration in this unique, rocky landscape in Tuscany.

This ancient market is often referred to as the oldest shopping mall in the world.

A 16th-century horror show built in a lovely Italian garden.

Gigantic mosaic sculptures of the figures on Tarot cards fill this colorful Tuscan garden.

Despite centuries of architectural innovation, this French castle is being built like it's the 13th century.

France's high-tech, future-themed amusement park.

Watch the local Netherlands birds from inside this giant eco-egg.

This former hydraulic laboratory is now a woodland dotted with old engineering models.

The struggle of a small Dutch island against the sea.

These jeweled relics have a scandalous and contested past.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

This abandoned Slovenian military barracks has become a punky-political art squat.

A whimsical bridge adorned with decorative dragons.

Longest fortress system anywhere in Europe.

The now-overgrown beach resort was once frequented by Yugoslav military elite.

Decorated with a staggering 1,380 ladybugs, the installation has turned what was once a grim, forgotten nickel mine into a landmark and a statement.

This famous city eluded concrete detection until the early 2000's.

The largest Neolithic ruins in the world hide a notably clean prehistoric metropolis.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

While not Turkey's deepest underground city, this subterranean redoubt is the largest.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

This giant work of Cappadocian pottery includes a memorial for the artisan who created it.

This hidden gem is bathed in beautiful natural light.

This hunter-gatherer architecture is believed to be the oldest religious complex known.