One of the oldest and largest castles in the world.

Four steel monoliths stand in the Qatari desert, in a breathtaking work of large-scale art by Richard Serra.

These 4,000-year-old tombs form a surreal landscape.

Skyscraper powered by wind turbines attached between its towers.

A state-of-the-art medical facility dedicated to treating beloved birds of prey.

This fountain pays homage to Qatar's history of pearling, the primary industry before oil.

The building is a gigantic piece of art inspired by the shape of a desert rose.

This seemingly random 30-foot statue of an oryx in Qatar's capital was a mascot for the 2006 Asian Games.

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

A 19th-century fortress and collection of artifacts offer a tour of Saudi history.

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

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

Iran's "Rose Garden Palace," built during 131 years of rule by Qajar kings, consists of 17 stunning structures.

Once a major stop on the Hejaz Railway, this desert station (complete with steam locomotive) has been abandoned for decades.

Carved into a towering rock mountain in Al Ula, this once served as a religious and political center in Hegra.

Lions carved into the rockface adorn these two tombs built into the mountains of Dadan.

The rocks around this mountain are filled with so many carvings that the area became known as the "open library."

This flagpole ranks among the world’s tallest and can be seen from three countries.

Known as the "Valley of the Moon," this Jordanian wadi is one of the most amazing desertscapes on Earth.

Perched above the bustling town of Kerak is a sprawling, ruinous castle that has witnessed nearly a millennia of Levantine history.

The most gigantic, swoony, intimidating trio of fingers in all of antiquity.

One man's labor of love, Amman's oldest home has become a time capsule with its doors permanently open to artists and guests.

Home to over 1,000 street signs, this museum offers visitors an opportunity to travel over 70 years back in time.

This exceptionally well-preserved ancient marvel also houses a small museum dedicated to Jordanian folk tradition.