This stunning natural double arch, the largest in the Alps, went undiscovered until 2005.

This salt marsh in Southern France is as pink as the flamingos that inhabit it.

One of the greatest maze designer’s greatest mazes.

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

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

Once a 19th-century brasserie, this McDonald's exterior celebrates Alsatian design and the "King of Beer."

One woman's decades-long obsession with the "La Fée Verte."

Walk through spectacular aisles of hanging meat and wagon wheel–sized cheese at the world's largest wholesale food market.

The deserted pirate-themed restaurant still entices explorers.

While the U.S. and Soviet Union were engaged in a space race, Poland built a UFO on the ground.

An industrial site turned into Hungary's most cherished natural wonder.

Underneath the city that invented pilsners are a series of historic tunnels that have been storing beer for centuries.

This unusually shaped mountaintop tower looks like a UFO floating over the city.

The deepest sinkhole in Central Europe comes with a grisly tale and an unusual nickname: “The Stepmother Abyss.”

The world's greatest slide descends 18 stories from this looping mountaintop viewing platform.

This former quarry is now a picturesque gorge that hides a sunken lake.

Bohemian paradise covered in majestic forests.

A spiral staircase twists to the top of this unusual Czech lookout tower.

Europe's largest natural bridge has a 19th century royal chateau built into its side.

A gorgeous stone viaduct crosses over a bucolic valley.

An abandoned 19th-century iron factory perched along the outskirts of an idyllic village.

Climb around the high waterfalls on series of iron ladders and bridges within the wildest gorge in the Slovak Paradise.

The world's newest astronomical clock is also its most accurate.

This spaceship sculpture in the middle of the Slovakian capital looks like it just crash-landed.