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

This Vietnamese hell cave lets visitors take a walk through a devilish underworld full of demons.

The subtle interplay of fire and water is hard to ignore at this remote Jamaican spring.

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

Bioluminescence in the reefs of the Maldives causes the sea to glow like a starry night sky.

The world's seventh-largest coral reef contains an incredible amount of biodiversity.

An underwater restaurant, surrounded by a coral reef.

The island residents are known for taking their quirky sense of humor with them to the grave.

This old-fashioned roadhouse's quirky neon sign is as famous as its enormous dumplings.

An eccentric collection of antique items shares space with a prop-quality witchcraft museum.

The hidden ruins of an old hydroelectric plant reclaimed by nature.

The largest pool at its elevation sits on top of one of the most expensive resorts in the world.

The oldest (maybe) swimming pool in Iceland is a stunning oasis built into the side of a lush hill.

The burial place of an obscure North African saint was turned into a macabre body preservation factory for the 17th-century Neapolitan elite.

Historical figures from New York City's Catholic community reside in Midtown.

This recently restored crypt was once plagued by liquefying coffins and exploding caskets.

Wander among the abandoned ruins of this once-powerful medieval town.

The oldest operating pharmacy in the world features 800-year-old recipes.

Legend says this mysterious stone head belongs to a woman who was petrified by an alchemist.

An oasis of shade and color amidst the bustle of the old city.

Believed to be haunted, this old cemetery is beautifully adorned with Spanish moss hanging from the trees.

This ancient jade mask depicting the Zapotec bat god was found in the ruins of the pyramids of Monte Alban.

This metal tower in the desert provides views of a handful of Nazca geoglyphs.

This giant statue of a vulva became internationally famous after an American exchange student got stuck in it.