The true age of this ancient stone circle is unknown, but its stunning vista isn't in question.

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

Climb down into the largest sinkhole in Qatar.

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

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

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

An unfinished tomb carved into a giant boulder in the Arabian Desert.

This high-design church is made up of two dizzying spirals meant to evoke the weaving together of marriage.

An earthwork sculpture built by Robert Smithson in the Great Salt Lake only reemerges during drought.

A castle perched precariously over the Crimean Sea.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

The hermits of Karoulia protect their asocial lifestyles by living on the vertical face of a treacherous precipice.

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.

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

Climb this overlooked gem's spiral staircase and you'll be rewarded with spectacular views of Glasgow.

A long spiraling walkway winds through the woods, and around a copper beech tree at the center.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

Fast food feels like fine dining at this award-winning modern Georgian building.

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

Rare recess caves fill this unbelievably beautiful Ohio park.

Possibly the oldest of Britain's ancient henges is also one of its most stark.

A spiral staircase twists to the top of this unusual Czech lookout tower.

This abandoned Olympic skiing facility still bears the scars of the Siege of Sarajevo.