Tubing through a cave lit with glowworms is a magical underground experience.

These two delightful animal-shaped buildings host a visitor center and wool shop.

The once and future home of New Zealand's famed Pink and White Terraces.

Deadly scalding and one of the largest hot springs in the world.

This electric green sulphur lake in New Zealand looks like a cartoonish radioactive dump site.

Major tourist destination known for its bubbling mud-pools and hot thermal springs.

A trading post in the North Pole where children send letters.

Four-story concrete hotel never opened to customers.

Open day and night, a church with three pews and Bibles.

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

Running under an entire mountain, the longest highway tunnel in North America is kept fresh using portal fans and jet fans.

An Alaska livestock farm devotes itself to harvesting wool from creatures that once ran with mammoths and sabertooth tigers.

Colorful boxes placed over the dead are left to rot and crumble.