An abandoned Soviet-era park that, when viewed from the air, looks like a pentagram.

Steaming blood-red hot spring from hell.

A stratovolcano located in the south of Iceland, with a long history of charted activity and a rich mythology attached.

The ancient settlement attracts tourists from all over looking to learn about the Chinese vision of the afterlife.

Ancient Greek oracle of the dead.

A cave network located at the southernmost tip of mainland Greece was once believed to be an entrance to Hades.

A single tree's 2,800 aerial roots give the appearance of a complete forest.

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

The island that holds the world-record for largest human massacre caused by animals.

World's largest cave was only discovered in 1991, and now offers tours to the public.

Museum showcases Japanese sexuality and some amazing ocean views.

A magical place that lets you play in and explore the world of Studio Ghibli.

The demolished ruins of a poorly located Japanese Love Hotel.

A beautiful, dense forest in the shadow of Mount Fuji, with a tragic reputation.

The largest catacomb system in the world.

Stalactites and stalagmites in a beautifully lit cave.

Island of trash twice the size of Texas floats in the Pacific.

Think you have a tough job? Try carrying 200 kilos through a cloud of sulfur down the side of a volcano.

New fungal and bacterial species call this deadly lake home.

An enormous, 30-story-deep hole in the middle of Guatemala City.

An isolated dive site teeming with cnidarians.

This structure among the trees was the result of divine inspiration.

Have fun at the world's first Buddhist waterslide park.

The most disputed archipelago in the world.