This strange geological landscape erupts with sudden bursts of water.

Tubing through a cave lit with glowworms is a magical underground experience.

An artistic garden environment of tile mosaic sculptures.

A strange machine made to evaluate the world economy using water and lots of tubes.

The world's only complete colossal squid specimen is on display at the Te Papa Museum.

The loneliest island in New York.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

A house carved into a rock in the 1940s.

Bizarre lunar-like landscape with thousands of large stone "hoodoos."

A canvas of crops grow from vibrant red soil in this terraced farmland.

A serpentine highway twists and turns over the treacherous Norwegian Sea.

World's first "penitentiary," meant to be humane, drove men insane.

A religious-themed park filled with folk art to bring biblical stories to life that fell into disrepair and now being restored.

A fiery crater has been burning in the Karakum Desert since 1971.

An underwater city for the dead.

A naturally beautiful, seemingly bottomless deep blue spring.

Monasteries on rock pillars, once accessible only by frayed ropes.

A spectacular cave and a beguiling lake.

Site of the largest impact event to occur over land in Earth's recorded history.

A gallery of underwater art that can be visited by man and fish alike.

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

A tiny microvalley etched into the side of Knocknarea Mountain hides another world.

Not one, not two, but three natural bridges remain in this captivating spot post-sinkhole.