One of the holiest Shi'i shrines in Iran honors the life and death of a learned noblewoman who became a saint.

This circular Iranian jail was once a political prison run by the country's secret police.

A historic trade hub teeming with gorgeous architecture, colorful goods, and vibrant designs.

The tower in this 1,000-year-old mud-brick village seems to vibrate for no apparent reason.

Burial site of a Jewish prophet revered in Iran.

The hottest, driest, and most scenic desert on Earth.

This ancient burial site is believed to be one of the first earthquake-protected structures in the world.

A dreamy mausoleum honors Persia's most famous poet.

In this tiny Iranian town playing on the roof isn't just encouraged, it's the only place to go.

One of the largest and oldest caravansaries in Persia.

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

Modern-day cave dwellers carve elaborate homes out of volcanic debris.

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

17th century mosque for Shah Abbas' harem.

Hydraulic systems in an ancient underground Iranian city.

Iran's colorful terraces are a rare geological masterpiece.

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

This ruined fortress was the stronghold for a persecuted medieval leader and his infamous Assassins.

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

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

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

A part of the world's largest marsh seems to be growing bright red Martian grass.

A chilling monument to Korean patriots who resisted the Japanese occupation.

Its humdrum facade only adds to its electrifying appeal: a rooftop with panoramic views of a shapeshifting metropolis.