The subterranean sanctuary home to local shamans is a sacred site for people of all religions.

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

An ancient impact crater on the outskirts of Pretoria.

This road winds through the steep coastal cliffside offering spectacular views for those who brave the drive.

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

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

Largest cave system in Africa.

These otherworldly caverns form Earth's oldest known cave system.

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

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

Known for the tunnel that leads visitors to the water.

This aluminum “stairway to heaven” has impaled at least a couple of birds.

Enjoy coffee and cake while viewing antique medical equipment at this unique cafe.

Anyone wanting to know what a dwarven mine sounds like need only visit the tunnels of this New Zealand artillery compound.

Only 68 people per day are allowed to visit this New Zealand bird-watcher’s paradise.

A galaxy of glowworms—larvae of a gnat—hides deep in the belly of these caves.

A glacier pocked with ice caves and surrounded by rainforests.

Tubing through a cave lit with glowworms is a magical underground experience.

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

The oldest teak bridge in the world is made from the remains of a royal palace.

Caves full of Buddhist statues, incredible rock formations and a deserted lagoon.

Gigantic unfinished stupa and the world's 2nd largest bell.

This unique temple complex remains off the typical tourist trail.

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