A collection of huge Pre-Colombian structures in Alabama.

A rusted metal giant pays tribute to Birmingham’s industrial past.

A miniature city built by a single hunchbacked monk.

A 56-foot tall statue of the god of fire looks out over Birmingham, Alabama.

These ruins are all that's left of the former Alabama State Capitol.

The largest prehistoric ruins south of the Sahara, once a powerful center of international trade.

This "dead marsh" sits among the largest sand dunes in the world, a forest frozen in time.

Local lore says a serpent-like beast lurks in the deep basin below the falls.

A mesmerizing sculpture marks the site where the activist was arrested after evading capture for 17 months.

The tallest residential building in Africa is an unsettling Brutalist monolith.

A safari-themed castle in the South African bush with the largest maze in the southern hemisphere.

Caves that can't seem to quit producing the remains of prehistoric humans.

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

This African beach is home to thousands of rare mainland penguins that are known for their annoying voice.

Formerly known as the Malay Quarter, Bo Kaap is a colorfully-painted suburb located in the “Mother City” of South Africa.

Despite many attempts to finish this overpass, it has been abandoned since the 1970s.

The original goat tower, the one that started it all.

The remains of diamond fever taken over by the desert.

Largest cave system in Africa.

Mined to a depth of 240 meters with a perimeter of about 1.6 km, the largest hand-dug excavation in the world.

Fascinating collection of Khoisan rock engravings, still situated in their original setting.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

Built to test magnetically levitated elevators, the tower also boasts Germany's highest visitor platform.

A striking 12th-century-style castle built on the edge of a cliff.