This 1967 experiment in modular architecture was designed to be a new model for urban living.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

Bordered by forest on three sides and the ocean on the other, the Great Dune of Pilat is the highest sand dune in Europe.

A young Gustave Eiffel assisted in the construction of this skinny metal observation tower.

This Bordeaux parking garage has 712 indoor spaces, and one outdoor.

The world's largest reflecting pool is just two centimeters deep.

The walls of Germany's Parliament still show the scars of the Red Army takeover in World War II.

A memorial in the Tiergarten is a reminder of the suffering inflicted on homosexuals by the Nazi regime.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

A restaurant and observation deck built in a unique broadcasting antenna.

A pair of giant stone heads represent the ancient Roman saints beheaded here.

This temple to the sturm and drang of Richard Wagner contains a dragon's cave and reptile zoo full of living "dragons."

A ruined castle stands atop a hill surrounded by dragon lore.

The tallest mountain in mainland Netherlands isn't actually very tall.

Dedicated to the American general whose reply to a German demand for surrender was simply "Nuts!"

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

What looks like an ordinary house from the outside is actually a rotating sculpture.

Six paintings reminding you that death is integral part of everyday life.

Angels and demons watch over newspapers in this deconsecrated church.

It's believed that the dead were once taken out of houses through these now walled-up doors.

It took more than 300 years to build this church, which is home to two sacred vessels believed to hold the blood of Christ.

A hidden bas-relief of a hare on a church main portal that brings good luck to the ones who find it.

The seat of the Mantua bishop holds many secrets within its walls.

The oldest church in Mantua was buried for centuries under the facades of other structures.