Groups of prehistoric tombs that dot the mountains of northern Oman.

This bazaar is one of the oldest in the Arabian world.

This spectacular mosque houses the second-largest chandelier in the world.

Environmentally crucial raptors like eagles and vultures are kept and protected in this massive sanctuary.

The South African dialect's complex history is immortalized in stone, in one of the world's only monuments dedicated to a language.

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

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

This historic observatory was established to keep shipwrecks from littering the Cape of Good Hope.

Over a million items cram the shelves at Africa's largest shop of used and rare books.

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

Once overlooking the town, this church now resides on a permanent tilt.

An unusual heating plant that has garnered notoriety for its distinct shape.

This almost a century old piece of architecture had been overlooked by most, except for the drunk and the homeless

In the town of Třeboň, carp is king.

Created as a "model concentration camp" to hide Nazi atrocities from the international community, this former camp-ghetto now holds a museum and memorial honoring the lives lost within.

Abandoned substation turned village treasure.

A larger-than-life statue of the German revolutionist stands proud in a small town where he never lived.

A mesmerizing landscape of 18th-century cellars carved out of the land.

The largest manmade caves in Europe now function as a motorbike club's headquarters.

The 14th-century ruins are said to contain healing powers.

Dedicated to the unsung history of human waste.

Mysterious painted skulls in Moravia.

This unusually shaped mountaintop tower looks like a UFO floating over the city.

These 17th-century mummies are no longer naturally preserved, but remain on display today.