A labyrinthine network of chambers with a storied past hides below Edinburgh's South Bridge.

Sprawled across the Great Hall ceiling are various constellations and images relating to the zodiac.

This obscure walkway links Edinburgh’s Old Town with one of the city's prime vantage points.

Neon artworks light up this dark Edinburgh tunnel.

This sculpture of disembodied body parts forms a poignant memory of the horrors of World War II.

Come for the oysters, stay for the priceless art honoring inventors across history and Scotland's favorite outdoor sports.

Museum about life, death, and cannibalism in the Stone Age.

In the ruins of Glastonbury Abbey lies the alleged resting place of the legendary king.

A dark Victorian well house now plays host to mystical waters and pagan shrines.

This hill and tower are steeped in legend, from King Arthur to the Holy Grail.

A little known Colombian theme park of giant curiosities.

Colorful lights and mirror-like brine pools create trippy illusions within the historic mine.

The Andean town where every single building is decorated with a brightly colored frieze.

This picturesque mansion has gone from opulent ruin to nature museum.

A dangling church built over a Colombian gorge.

An explosion of natural color known as "the river that ran away from paradise."

The caldera of this mini-volcano has been turned into a naturally heated mud bath.

The final resting place of the living embodiment of the famous Forest Service symbol.

A museum in the former home of Marxist revolutionary Leon Trotsky.

The meteor that sealed the fate of the dinosaurs landed at this site, one of the largest impact craters in the world.

A gargantuan crystal kingdom.

This church, buried halfway in lava rock, is all that remains of a Mexican village destroyed by a volcano.

Underwater art project will double as a massive artificial coral reef to help regenerate the damaged ecosystem.

Huge hole looks down onto an underground beach populated with sea lions.