On this wooded path, a stained-glass window creates a spellbinding forest cathedral.

A spectacular impact crater in the rugged heart of Central Australia.

The world's largest underwater restaurant is submerged off the southern tip of Norway.

The world's second largest salt mine, said to have been discovered by Alexander the Great's horse.

Archaeologists are still unraveling the secrets of the brutal massacre that wiped out this ancient fort.

This dizzying span over the ancient Algerian city was once the highest suspension bridge in the world.

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

A fairytale island floats in the middle of Italy's little-known Lake Orta.

Modern commuters still pass through this 2,000-year-old Roman archway.

It took 82 years and four different plaques to finally get the story right.

Started nearly 100 years ago, this science experiment just keeps on going, ever so slowly.

This dramatic sea spire is home to the world's rarest insect and is part of the lost continent of Zealandia.

Lake within a lake.

A neutrino detector built into the largest man-made underground cavity in the world.

World's oldest and largest space launch facility, once a secret missile testing site.

Rusting ships sit in a desert where a sea used to be.

Roam the cradle of the Cuban Revolution with life-sized dinosaurs.

A volcanic old faithful, Stromboli has been erupting continuously for the last 2000 years.

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

A hiking area billed as a possible home to Bigfoot.

Live long and prosper in Vulcan, Alberta.

Jurassic theme park in the small town of Erlian.

The real life Hobbiton, this sheep farm has been forever transformed since being built for The Hobbit film series.

Australian Lake set aglow by Noctiluca Scintillans.