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

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

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

A stunning bridge that appears as if it's lunging to the shore, and has a legend of a devilish architect.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

Dress up like a miner and take a slide into the disco-lit depths of this once foundational salt mine.

Soaring over 6,000 feet in the Bavarian Alps, this beer garden was once Hitler's 50th birthday present.

The largest ice cave in the world is thought to be the entrance to hell according to Austrian legend.

Originally envisioned by King Ludwig II to rival Versailles, Herrenchiemsee's "New Palace" remains half-gilded for lack of funds.

In this truly magical place, rent hasn't been raised since the year 1520.

This century-old cinema house has a marquee that has been hand painted by a single man for over 25 years.

Go surfing on this urban wave, "hacked" by local surfers.

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

One of the largest ochre quarries in the world, hidden in a limestone landscape.

The Suurhusen church tower in Germany leans over farther than the famous Leaning Tower of Pisa.

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

The birthplace of Karl Marx is now a museum dedicated to the communist revolutionary's life and work.

A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.

Known for the tunnel that leads visitors to the water.

Dolphins, ancient clams and hundreds of waterfalls make this one of the world's top tourist destinations.

One of the world's steepest streets seems to have houses sliding down it.