An 18th century wonder of the world, lost in WWII, re-created at the Catherine Palace.

While not Turkey's deepest underground city, this subterranean redoubt is the largest.

A six-ton wedding present for the King of the Scots.

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

The hottest place on the planet.

Ethiopia's "smoking mountain" is in one of the hottest regions on the planet and is home to two lava lakes.

The world's second-tallest flagpole stands proud despite dropping rank.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

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

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

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

The second oldest continuously operating bar in Louisiana.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

A museum dedicated to the history and exploration of both popular music and science fiction.

Every equinox this Maya pyramid puts on a spooky ancient light show.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

A beautiful geyser under environmental threat.

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

The celebrated eyesore created by starry-eyed sweethearts.

The site of the climactic scene from the classic horror film is now a historic landmark.

This symbolic piece of New Orleans architecture is also home to a few ghastly stories.

Stroll through a wonderland of stupendous moss-covered trees.

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