Yemen's "Stone Palace" looks like it was carved right out of the tall stone column on which it is built.

A city built from mud and known as the "Manhattan of the desert."

Romania's "Red Ravine" is a little-known natural wonder that bears a resemblance to the Grand Canyon.

A mysterious ancient network of thousands of perfectly straight lines stretching across miles of Bolivian desert.

A 1,500-year-old, 3-story subterranean city where ancient Persians took refuge in times of war.

The remarkably well-preserved final resting place of a powerful ancient Thracian king.

Local lore says the devil built this beautiful medieval bridge to help a fleeing bandit.

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

A tower-like theater in the Swiss Alps built to withstand the high winds and avalanches of the mountain pass.

Nuclear waste experts study this prehistoric crater lake to envision landscapes one million years in the future.

This quiet park's strange sedimentary spires were named after Kodak's color film.

Elaborate patterns adorn the city's disappearing traditional architecture.

The oddly shaped, steam-spewing building is now an art studio and gallery.

Conspiracy theories and occult legends surround this mysterious natural rock formation.

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.

Go through the looking glass in Tokyo's Wonderland-themed shop.

Bacteria and algae give the salty water its bubblegum hue.

This romantic, decaying 13th-century ruin on the edge of Sherwood Forest is reputedly one of England's most haunted places.

An abandoned Soviet-era mining town in the mountains of South Kazakhstan.

The museum calls itself the "National Museum of the Paranormal" and is full of eerie oddities.

This isolated structure beckons adventurers with sublime views of the Faroe Islands.

Remnants of the rich history of fish salting in this ancient Mediterranean port town.

A collection of 16,000 antlers crammed beautifully into a small shed.

The most southerly spot on New Zealand's South Island is home to surreally shaped, permanently mangled trees.