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

Putrefaction plateaus in Iran, where the dead were sent for decontamination before going to their final resting place.

The palace of the King of Kings, burned by Alexander the Great.

Hydraulic systems in an ancient underground Iranian city.

Named after a legendary garden called Eram in southern Arabia, built by order of Shaddad, an Arab king who wanted to compete with Paradise.

Burial site of a Jewish prophet revered in Iran.

Iranian tombstones shaped like male and female sexual organs.