The beautiful baroque library of the Hapsburg empire.

An auroral research program that superheats the ionosphere.

This pseudo-steampunk weapons facility is the world's largest wood and glue structure, and packs quite a wallop.

The world's first nuclear power plant is open to visitors looking to role-play a meltdown.

The official atomic museum of the United States explores the explosive and productive history of a much maligned energy source.

Home to the deepest rift anywhere on Earth.

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.

The quintessential Japanese rock garden has existed for more than 500 years.

Isolated atop this Balinese sea crag is a lovely Hindu temple that is said to be guarded by sea snakes.

This fantastical waterfall is hidden in a cave located in a cracked cliff.

This neon blue river gets its color from a unique mix of bacteria and volcano minerals.

A lovers' beach, tucked below the surface of the island, provides a safe haven for romance.

Rock-cut cave complex filled with ancient Buddhist artwork.

An abandoned castle owned and ignored by Masons carries a cursed history.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

Most-visited and most-photographed slot canyon in the American Southwest.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

This attraction was abandoned after the Chernobyl disaster.

One of the most accessible undersea plane wrecks in the world.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

This derelict superstructure was a very important warning system for the Soviet military.

This massive wooden building contains a giant Buddha, healing pillars, and tame deer wandering the grounds.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.