These natural wonders have taken millennia to form into the stunning marvels they are today.

Climb around the high waterfalls on series of iron ladders and bridges within the wildest gorge in the Slovak Paradise.

A bizarre form of natural mummification was discovered in the church of this Frisian village.

A maze of crosses marks the jumbled divide between the Netherlands and Belgium.

Part modern art project, part traditional chapel, this see-through church is only substantial from the right angle.

This historical Netherlands fortress still bears the marks of its single siege.

Repurposed space and ultra-modern construction collide to create this geometric wooden spectacle.

This imposing tower named after the mythical sword of King Arthur is considered the tallest freestanding climbing wall in the world.

Live out your childhood construction fantasies in this one-of-a-kind gyrating hotel.

Buried next to Pompeii, this lesser-known Roman villa was the opulent vacation home of Emperor Nero's wife.

Afghanistan's first skatepark, located in war torn Kabul.

The West's first incursion into the Afghan world lies buried beneath a military base.

This abandoned secret city is a crumbling wonderland of Soviet ruins.

A railway bridge leading nowhere stands lonely in the middle of a meadow.

The Uyghur settlement in the middle of a lake continues to raise questions.

Mysterious spherical rocks in the semi-desert of western Kazakhstan.

Natives of this mud-brick desert village use an ancient irrigation system to grow sweet, seedless grapes.

Local lore says this 700-year-old tree has sacred and medicinal properties.

This unique wooden mosque resembling a Chinese pagoda was said to be built without the use of nails.

Lonely minaret stump of a destroyed city.

An unusual monument to a gentle giant who became a Kyrgyz hero.

The remains of an ancient city-state along the Silk Road.

The remains of a medieval city loom in one of the most isolated desert regions of Turkmenistan.

A tiny mosque decorated with mosaics using an early form of recycling.