Stuck in a bygone era, the oldest subterranean shopping street in Japan hides beneath the popular Asakusa district of Tokyo.

Colin Stokes "got a bit carried away" and built a castle that looks like something out of Tolkien.

These aggressively sustainable art homes look like something out of 1970's science fiction.

An eerie ship cemetery with gunfire as a soundtrack.

Famed for its pie, this eatery has a hidden tunnel that allowed Catholics to secretly walk to church during the Reformation.

Generations have refused to move this doll from its dusty resting place to preserve a castle from a watery fate.

Four alabaster giants contemplate the tides on the shore of Denmark.

From Coke II to Google Glass, this exhibit features some of the most spectacular commercial flops.

Micro-nation based around a nine-story high illegally built tower.

A winding staircase that appears to lead to nowhere is actually a diving platform into the Wellington Harbour.

The world's first fully-fenced urban ecosanctuary is a haven for New Zealand's rare and endangered species.

Geothermal resources are cooled in this oddly-shaped structure before being used for irrigation

The accidental discovery of this gilt bronze head led archaeologists to find the Roman Baths in the city of Bath

The oldest residential street in Europe also features an optical illusion.

Queen of the waterlilies, so big and strong it can support the weight of a human.

This massive waterfront market is located at the "gateway to the Amazon."

Curated with the cooperation of the passengers and their families, this museum tells the story of the 29 victims and 16 survivors of Uruguayan Air Force Flight 571.

The tallest mud-brick structure in the world has been standing since the 1500s.

Vietnam’s everyman “broken rice” dish is given one major upgrade at this humble institution.

A group of college students hauled a desk up a mountain more than 40 years ago. The notebooks inside have become a makeshift time capsule.

The ruins of this magnificent Scottish castle blend both Gothic and Renaissance architectural styles.

A subterranean shelter remains intact under a busy Paris railway station.

Skeletons, medical artifacts, and other obscure and precious treasures all displayed in a wooden pharmacist's cabinet.

Collection of antique taxidermy and natural specimens, near one of Paris's oldest flea markets.