The hallucinogenic center of the ancient world.

The former Nazi Germany concentration camp stands as a museum to remember this dark chapter in European history.

Millions of years of oxidation make a drive down this winding Death Valley road surprisingly colorful.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Climbing Iceland's highest peak on the rim of the Oræfajökull volcano.

A black sand beach where glacial fragments wash ashore and look like sparkling diamonds.

This fantastical waterfall is hidden in a cave located in a cracked cliff.

Berlin's old airport.

The way that light hits a stained glass window on a specific day is one of many "clues" to a mysterious treasure.

This modern district offers a stark contrast to Bordeaux's terrace-lined squares and waterfront façades.

Guests can stay at a hotel in the former French abbey where lie the tombs of King Henry II and King Richard the Lionheart.

Ivy-covered Medieval tunnels cut through this charming town in France's Loire Valley.

A medieval house adorned with enigmatic carvings, including one of a man displaying his masculine attributes.

This submersible road connecting a French island to the mainland is lined with safety towers for when the tide strands travelers.

Home to the "Rat King" of Nantes and other wonders of the natural world.

A modern and feminist reinterpretation of the famous Wallace Fountains.

This small island, a byproduct of 19th-century canal construction, is now home to a charming Japanese garden.

The sunken structure looks like the victim of a catastrophic flood.

Do these monsters look familiar? The gargoyles on this church are all from pop culture.

These red marks, seemingly placed at random, are in fact not.

An aluminum skeleton brings Chinese mythology to the French shore.

A well-worshipped shrine to the Virgin Mary nestled inside the last of Zagreb’s historic gates.

An eclectic art form practiced by untrained masters is celebrated at this museum in the heart of Zagreb's old Upper Town.

A World War II evacuation tunnel turned into a history display of Croatian state and people.