This futuristic observatory at the top of the Pyrénées offers unrivaled views.

The final resting place of a space program monolith.

NASA's leading space science lab started by a co-founder with deep ties to the occult.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

Sleep snuggled in a sphere suspended atop the forest canopy of Vancouver Island.

Moonbows over Kentucky.

This attraction was abandoned after the Chernobyl disaster.

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

The private clubhouse for the members of the Academy of Magical Arts.

A thin pane of glass keeps visitors from sliding off this futuristic skywalk.

A Hawaiian stairway to heaven—that you can't climb.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

A historic observatory precariously perched at the "Top of Europe."

Submerged trees jut ghost-like out of an idyllic turquoise mountain lake.

The abandoned Japanese amusement park once loomed as a dystopian Disneyland.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

A massive underwater sinkhole made famous by Jacques Cousteau.

Roman ruins top white travertine terraces formed by ancient hot springs.

The world's largest bioluminescent area was undiscovered by science until 2005.

The world's highest and most dangerous infinity pool lies at the precipice of Victoria Falls.

Australian Lake set aglow by Noctiluca Scintillans.

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