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.

An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.

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

This extraordinary geological oddity resembles human-made pavement.

Islanders once used this dramatic, otherworldly landscape to hide their cattle from Viking raiders.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

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

An enchanting rocky island of scraggly baobabs surrounded by an ancient sea and sprawling salt pans.

This amazing 15th-century mural remained hidden in plain sight for centuries.

The fading, forgotten remains of a once bright and booming factory.

Three hundred illuminated pillars form an “artificial forest” in Medellín.

A former poultry store that looks like a giant duck and is one of the "seven wonders" of Long Island.

In medieval times this small stone seat was used as a bizarre way to punish insolvent debtors.

This neighborhood of futuristic ball houses looks like an alien settlement in a science fiction film.