Noirish green neon marks the location of one of the oldest private detective agencies in France.

A surrealist timepiece by the artist of melting clocks.

A mechanized clock where a man fights off a dragon, crab, and rooster.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

Notorious artist squat renovated into legal studios.

This modest marker near Notre Dame identifies the very center of Paris.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

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

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

This 14th century wine cellar is home to the oldest barrel-stored wine in the world.

The only sea in the world that has no land boundary.

The romance of early commercial flight still fills this Art Deco destination.

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

Once America’s most beautiful army base, this abandoned military fort on the coast of Monterey Bay has been left to the elements.

This spectacular public market has got meat, fish, vegetables, baked goods, and enough kielbasa for a lifetime.

Look closely and you’ll notice that the color changes a third of the way up the tower.

Once a black market electronics marketplace, now an otaku shopper's paradise.

The world's largest wooden structure.

The final resting place of the great navigator, or maybe his brother.

A 16th-century Andalusian palace.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

Single runway interrupted by a busy road that cuts across its middle.

This long line of cement defensive wedges is named after the famous chocolate bar for obvious reasons.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”