This 18th-century folly is one of Europe's rare "garden mosques."

For those going through a life transition, a place to leave behind a piece of your former self.

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

Despite being burnt down multiple times, the ruins of this South Carolina church are still standing.

Amazing pre-Civil War ruins alongside a shallow, rocky river that hosts beautiful (but endangered) lilies.

This head-spinningly bizarre Depression-era art cave is wall-to-wall quartz and Jesus.

This South Carolina water tower is an icon of the city of Walterboro, but it also once served as the county jail.

The uniquely-designed winter home and sculpture studio of Anna and Archer Huntington.

A rapidly disappearing authentic bit of the old south.

These locks on North America’s oldest canal are named after a porcine rock formation.

A massive, fading granite poem is all that remains of one Whitman superfan's tribute to the famous writer.

Thanks to its curved shape, this incredibly durable dam "whispers" to visitors.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

Exotic feline breeding compound and conservation center.

Salt is slowly eating away this abandoned saltworks town in the desert.

The "Fun Spot of the Desert" is now a haunting ruin, and a reminder that putting a water park in a desert is a bad idea.

Witnessing the might of this dessert-colored desert waterfall is a rare, powerful treat.

North Carolina's finest examples of Native American pictographs have survived for 5,000 years.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

A former mining hospital is now a vibrant artistic hub.

A medieval castle in the middle of rural Texas.

An ancient burial ground believed to have been used for ritual sacrifice.

The "mysteries" of this quintessential roadside oddity were almost destroyed by neglect but were saved by fans of kitschy wonder.