This former Portuguese defensive fort atop a hill was occupied for thousands of years.

Al Rahmah Mosque appears to "float" atop the Red Sea.

This tower has survived the times despite being composed of mud and camel hair.

A network of tunnels runs underneath the buildings of this ancient village.

These desert alfalfa farms redefine the meaning of crop circles.

Climbing the "mountain of frustration" is no easy feat.

It's believed human settlements from the Palaeolithic Age were established not far from this canyon.

In the middle of a barren desert, a massive, solitary rocky thumb juts out.

Abandoned station along an ancient pilgrimage route.

This fortress sits atop a centuries-old well system.

A historic structure that once housed pigeons used by farmers to help fertilize farmland.

This giant volcanic crater holds its very own field of salt.

These towering cliffs jut dramatically from the middle of a barren desert.

This mesmerizing, colorful structure looks like a tent made from stained glass.

Village of slate houses, built on a white marble outcrop.

Within the Saudi Arabian desert lies a 2,000-year-old ghost town made of stone and mud.

More than 100 monumental tombs carved into rock are preserved at this ancient Nabataean site in the Arabian Desert.

An unfinished tomb carved into a giant boulder in the Arabian Desert.

Once a highly polluted body of water has now been transformed into a gorgeous lagoon.

This vibrant side road in Doha was painted light blue to reduce heat.

An abandoned fishing village in pre-oil Qatar.

Some of the ancient-looking huts among these strange rock formations aren't ancient at all, but built as part of a movie set.

The enormous diamond-shaped building packs a trove of academic and literary treasures into one futuristic space.

A 19th century pearling and fishing village abandoned before Qatar's economic boom.