Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.

A 16th-century fountain marks the site of a lost medieval cemetery once filled with mass graves.

The Argonaute submarine was the French navy's pride and joy in the 1950's.

This banal Parisian entranceway is not what it seems.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

This Parisian fountain is a little bit fantasy and a little bit nightclub.

A majestic lion statue guards this Parisian botanical garden, and feeds on an unsettling item.

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

The very center of Paris is surrounded by a bevy of strange good luck rituals.

Notorious artist squat renovated into legal studios.

Swarovski's museum/theme park is a fake diamond fantasia overlooked by a giant.

Crossing this suspension bridge feels like walking through the sky, a fitting tribute to the head of the Apollo program.

The Roman Emperor's lost summer home and grotto full of enormous sculptures sit along the Italian seashore.

Romans built the world's tallest artificial waterfall in 271 BC.

A whimsical bridge adorned with decorative dragons.

This massive subterranean fissure is known as the "underground Grand Canyon."

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

This centuries-old Italian chapel hangs midway down a sheer cliffside.

A beautiful maze marks where three countries meet.

The 16th-century church was kept in its ruined state as a reminder of the casualties of World War I.

A lone cannonball remains lodged in the walls of the Hotel de Sens as a sober reminder of a revolution.

A sinister pyramid in the Frari contains the heart of the famous neoclassical sculptor.

The giant skeleton sculpture is surprisingly well-traveled.