Hundreds of glow-in-the-dark objects light up a museum in a historic zinc mine.

A popular place to pick up prehistoric coral fossils from the time when Michigan was an ocean.

A narrow strip of land is home to the tallest migrating dunes in Europe.

Just another ancient, mysterious Irish stone circle.

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

This beautiful ancient site is dotted with perforated sandstone pillars considered sacred by some Native American groups.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

A red sandstone freestanding monolith rises out of the sea in northern Scotland.

Unusual hexagonal rocks formed by cooling lava named for their resemblance to traditional Japanese tatami mats.

A strange rock formation with numerous legends trying to explain it.

The English town of Mansfield likely got its name from this enigmatic breast-shaped mound rising abruptly from the earth.

This rare basalt crater lake is used to study the Moon and Mars.

A boat ride through utter darkness, lit only by headlamps, reveals an emerald green pool locals believe is sacred.

A mysterious crater-like pond has a spooky tendency to empty and fill with complete disregard to rainfall patterns.

Huge spherical rocks in the middle of the prairie.

These two giant boulders mysteriously perched on a 60-foot cliff may have been slung up there by a raging tsunami.

This narrow canyon has been carved by the river over thousands of years into spectacular and curious forms.

This rare example of a "tidefall" is a spectacular drop from the cliffs down onto the beach.

It is said a heartbroken man visited the gap every day to stare blankly out at the sea.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

A group of glacial erratic boulders are improbably balanced on white limestone pedestals.

No one knows who built this strange cave of worship or exactly why.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

A pair of large white marble lions guard this stretch of the Mojave Desert, and it is utterly mysterious how they got there.