The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

Famously misunderstood wonder of the ancient world

Elevated freight railway turned wildly successful urban park.

A sharp bend in a dramatic river canyon cut through red rocks.

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

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

Pop culture has helped to keep this iconic British building from being destroyed.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

Eighty million natural history specimens call this gargantuan museum home.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

The first tunnel to be dug beneath a river, repurposed as an art and museum space.

This tangled English forest looks like something right out of a fairytale.

The vast chamber inside this abandoned cooling tower looks like something out of a sci-fi dystopia.

Visitors to this Belgium graveyard are greeted by the grieving stone parents of the young men lost to war.

Rare wooden escalators lead deep down into an otherwise staggeringly monotonous tiled tunnel.

A little sculpture with a large wardrobe.

Hiding the longest subterranean river known in the world.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

Climb inside an iron crystal magnified 165 billion times its normal size.

Amsterdam's Red Light District leaves little to the imagination.

This giant radio telescope would be a rusting ruin if it hadn't become such a beloved relic.

In the Netherlands, one of the world's largest private car collections can be found.

This towering church is home to a world-famous organ and a treasure trove of medieval art.

A radio telescope for listening to the stars, based in one of the cloudiest countries in the world.