This sanctuary is home to donkeys who finally get to rest after a life of toil.

Quite simply the largest tree in the world (by volume).

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

One of the world’s largest collections of petroglyphs records 2,000 years of human activity.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

This spectacular track has run continuously since 1882.

The highest bridge in America was built for an almost unnervingly small amount of money.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

This blowhole is supposedly caused by a trapped monster.

A museum dedicated to the history and exploration of both popular music and science fiction.

Running under an entire mountain, the longest highway tunnel in North America is kept fresh using portal fans and jet fans.

This WWII-era military installation once held an entire city within its walls - now, its walls are falling down.

This small city where almost everyone lives in the same building can only be reached via North America's longest tunnel.

The world's largest concentrated solar power plant.

This vast masterpiece of Moroccan architecture spreads across 20 acres.

Numerous impressive carvings are embedded in the trees lining this street in Marrakech.

The largest madrasa in Morocco once housed more than 900 students within its exquisite walls.

God's Saharan sandbox of wrath.

Vast stretch of tide-pools with a unique Moroccan charm.

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.

A fortified city, home to a remaining population of five families

World's largest film studio, where visitors tour the decaying sets that litter the harsh desert environment.