These curious caverns have been home to mushrooms, gangsters, and disco.

Nursery with extensive collection of flesh-eating plants operated by the author of "The Savage Garden."

The world's northernmost aquarium looks like it has fallen over.

An abandoned lighthouse awaits its destiny: being buried under shifting sand.

This "preacher's pulpit" once used for pagan ritual, is home to a new, and dangerous ritual.

This giant boulder is pinched over a 1000-meter abyss by two mountains.

The burning of this 12th-century church kicked off a campaign of Norwegian Black Metal terror.

An artist's mausoleum with a haunting echo.

This abandoned radar site is slowly being taken back by the jungle, its mission cut short by the end of the Cold War.

An enormous concrete structure built over a nuclear crater.

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

The hottest place on the planet.

The tallest residential building in Africa is an unsettling Brutalist monolith.

Wondrous stalactites house thousands of bats in these African caves.

Filled with goldfish swimming in a shallow pool of sea water, this ancient crypt is more wishing well than burial site.

Millions of glowing microscopic organisms light up the waters of this luminous lagoon.

A nuclear power plant abandoned along with an international allegience.

This subterranean disco dance club in a Cuban cave comes with bright lights and a dark legend.

Former WWI oil tanker played a variety of roles in history, its tantalizing rum-flavored scent being the only constant.

The remains of a town so thoroughly destroyed by French forces that the citizens simply left.

This domed temple was built in a hidden cave mouth as a refuge for sinners seeking absolution.

A sunken idol welcomes parishioners to Davy Jones' Locker.

Natural cathedral designed by Italian artist Giuliano Mauri.

Hidden in an Italian forest is a completely homemade amusement park that has taken a lifetime to create.