The ancient necropolis houses the immense rock-cut tombs of four Persian kings.

Ancient structures used to make and preserve ice in the deserts of Persia.

A 1,500-year-old, 3-story subterranean city where ancient Persians took refuge in times of war.

A spectacular rainbow of stained glass makes the "Pink Mosque" one of the most beautiful in Iran.

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

Mirrors and glass shards cover every inch of this arrestingly beautiful mosque.

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

This miniature take on the Kremlin is one Dutch man's retirement project.

Macabre astrological automaton clock dating to the late 1400s.