Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

Eighty million natural history specimens call this gargantuan museum home.

The most loyal of little dogs, or a Victorian era publicity stunt?

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

A beautiful geyser under environmental threat.

A monument celebrating the idea of reaching inaccessible places.

The fairy tale castle of the "fairy-tale king."

France's most famous cemetery, with some of its most curious tombs.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

A faux desert landscape in the middle of the jungle that sprouts oases during the rainy season.

Australian Lake set aglow by Noctiluca Scintillans.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

A modernist landscape of water and sci-fi concrete.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

These fantastically named natural pools look like something out of a Scottish myth.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

Every autumn, this hillside is ablaze with red summer cypress.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

An ethereal glowing blue ocean cave in Croatia.

Once the most densely populated place in the world, this island is now a ghost town.