A massive work of modern art that appears to be a crop circle in the middle of the desert.

Even King Tut was intrigued by the glass of the Great Sand Sea.

An endless sea of white conical domes.

An ancient city exhumed from the depths of the ocean.

Once the longest bridge in Ireland, this rusting span sits abandoned and overrun by nature.

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

Sleepy fishing port not included on many maps.

An eerie former warehouse turned cistern turned movie set.

The true depths of these stunning Moroccan caves are unknown.

The other side is actually green.

Rocky Atlantic beach home to a stunning stone arch.

One of the most spectacular canyons in the world.

Mosaics, storks, and brothels—this ancient city has it all.

Morocco's Argania trees are infested with nut-hungry goats.

A stoic rock cairn is all that remains to remember one of the more brutal instances of frontier treachery in American history.

A museum has some wedding cake dating to the Teddy Roosevelt administration, and some bacon from FDR's.

A well-preserved Ancestral Puebloan ruin tucked beneath a desert cliff.

The highest peak in Utah is the hardest to reach, but only if explorers choose the hard way.

Oddly shaped rock formation, misassociated with a nearby utopian community.

Settled by the Church of Jesus Christ of Latter-day Saints in 1859, this abandoned frontier town has appeared in several films.

Jurassic Park—A Still Life.

Visitors to this library are in for a real-world education in modernist architecture.

In the heart of Brigham Young's promised land sits a festering plot of industrial ruin that has been claimed by society's outcasts.

Hundreds of drawings left by the land's previous inhabitants remain mysterious.