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

17th century mosque for Shah Abbas' harem.

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

Looking for a unifying history, Uzbekistan finds its answer in a 14th Century Turco-Mongol conqueror... despite the fact he wasn't Uzbek.

This "tower of death" has acted as an observatory, a religious hub, and an executioner's lair.

Light still pours into the ruins of this ancient Islamic observatory.

The Avenue of Mausolea is a series of grand palatial tombs.

The headquarters of Pakistan's first press club remains a haven for debate and discussion.

This commanding mausoleum holds the remains of Muhammad Ali Jinnah, the founder of Pakistan.

Space-age minarets towering over Islamabad.

An inspired museum dedicated to the patron saint of enslaved people, inside the cloisters where he lived and died.

A neighborhood church's unusual abstract stained glass was the final project of avant-garde artist Jean Cocteau.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

The only quarter of the Old City not dedicated to a major world religion.

Neighborhood in Jerusalem is home to the ultra-orthodox haredim.

Descend 2,030 years into the past in an ancient tunnel built to support Jerusalem's most famous wall.

The home of the Dead Sea Scrolls is an abstract modernist dream.

This Dresden church was purposely rebuilt Protestant after being demolished in World War II.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

The place where World War I began.

This historic cemetery was inaccessible for several years due to dozens of land mines.

This brutalist monument is inscribed with 9921 names of Yugoslav partisans who perished during WWII.

A war-torn Olympic relic is being overtaken by graffiti and nature.