The largest pool at its elevation sits on top of one of the most expensive resorts in the world.

The sunlight passing through the opening of this huge cave system creates a magical effect.

Explore this medieval cathedral by trying to spot all the malevolent monsters hiding in its beautifully colored windows.

This metal tower in the desert provides views of a handful of Nazca geoglyphs.

This stack of stones honors a murdered 18th-century woman.

Known as the "Stairway to Heaven," this historic canal dates back to the 1700s.

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

These layered sandstone mountains in China look like they are made of pressed crayons.

This vertical pinnacle in China was the inspiration for the floating mountains in the movie “Avatar.”

A sinkhole and now a swimming hole, too, full of dazzling turquoise water.

A magical sinkhole on the Yucatán Peninsula is adorned with mini waterfalls and hanging vines.

Climb down into the largest sinkhole in Qatar.

Raging waters have created a strange geological site that looks like something off of a progressive rock album cover.

Romania's "Red Ravine" is a little-known natural wonder that bears a resemblance to the Grand Canyon.

After millennia of erosion by sand and churning water this Brazilian valley now looks like a lunar fantasy.

A massive natural rock arch gives the Tuscan mountain its own window to the sky.

A long, winding trek rewards you with a gorge so captivating it inspired a painting in the Tate.

Strange rock formations tower above the river that snakes through this enchanting Icelandic canyon.

Rare recess caves fill this unbelievably beautiful Ohio park.

The hollow trunk of this 650-year-old tree was used as a hideout by two Jewish brothers during World War II.

This deceptively beautiful island was once home to a German concentration camp and known as "Death Island."

This isolated island is often capped by its own fluffy cloud.

A lone tower rises above the cliffs in a city park, offering fantastic views of the Connecticut landscape.

This 500-year-old Tudor home is a treasure trove of history and mystery.