Iran's colorful terraces are a rare geological masterpiece.

This giant underground cave chamber can only be accessed through a small opening at the top.

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

An imposing Omani fortress surrounded by date palm trees.

Nature's water park in the Wadi Bani Awf valley is full of pools flanked with cliffs and natural water slides.

Traditional architecture and ancient irrigation systems are on display in this gorgeous mountain village.

One of the world's largest salt caves is filled with fragile salt sculptures, salt rivers, and huge salt megadomes.

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

The oldest surviving mosque in the UAE has mysterious origins and unusual architecture.

One of the largest sand dunes in the world is nicknamed the "Scary Mountain" due to its steep slope and sharp incline.

An abandoned desert hamlet swallowed up by sand.