Only known mainland rookery of the threatened Stellar sea lion.

This historic steamboat is scuttled just a few hundred feet from where it was built over a hundred years ago.

A once-booming Mississippi River town with a history of racial violence is now eerie and mostly abandoned.

An enormous overgrown greenhouse teeming with graffiti and wildlife.

High in the clouds of San Marino sits an ancient tower with some curious prisoner graffiti.

The world’s highest ski resort was deserted after an 18,000-year-old glacier melted away.

A subterranean Holocaust refuge within one of the world's longest cave systems.

Inside the Šomoška National Nature Reserve exists a unique rock formation rarely seen in the world.

Hidden by the roadside in the Iya Valley, this gem brings together folk monsters and the region's unique geography.

Centuries of crashing waves carved out this small hole in the rock, which lights up at certain parts of the year.

The home made famous by the 1983 holiday classic is now a perfectly preserved shrine to the movie.

The island of Lanai in Hawai'i is a paradise for cats and cat lovers.

This Singaporean food-court stall was home to the world's cheapest Michelin-starred meal.

This 5,300-year-old tomb with mysterious carvings crowns an Irish mountain.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

Small church on top of a huge rock column.

This small city where almost everyone lives in the same building can only be reached via North America's longest tunnel.

The oldest Jewish cemetery in Southeast Asia is a monument to a disappearing community.

The oldest Jewish cemetery in Europe survived Hitler's Germany.

This historic cemetery was inaccessible for several years due to dozens of land mines.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

A 66-million-year-old rock formation stands tall over Mumbai, offering stellar city views.

These Benedictine nuns have been making artisanal cheeses since before it was cool.

This Japanese-inspired labyrinth of hot springs is hidden in a Chilean forest.