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

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

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

This beautiful system of tunnels built into natural rock serves as a centuries old plumbing system.

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.

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

A giant bisected onion dome remembers the Iraqis who died in the Iran-Iraq War.

A 2200 year old vessel may have been able to keep a charge.

9th century Abbasid mosque, damaged in modern warfare.

The sacred shrine of the Yazidis.

Celebrated as a center of civilization, the remains of the ancient city have been nearly destroyed by greed, egoism, and war.

The world's oldest map of the holy land gives us a fragmented glimpse of the layout of biblical nations.

One man's labor of love, Amman's oldest home has become a time capsule with its doors permanently open to artists and guests.

Gladiators battle and chariots race daily in the ruins of a once-great Roman city.

A natural wonder in south Denmark.

A historic scientific breakthrough that crosses nine borders.

The labyrinthine home of the National Archives of Estonia is an experimental blend of architecture, art, and history.

The largest lake in the Faroe Islands seems to be held hundreds of feet above sea level thanks to an optical illusion.

This isolated structure beckons adventurers with sublime views of the Faroe Islands.

This remote island village was in danger of depopulating completely until a tunnel was built to connect it to the rest of the world .

Nuclear waste experts study this prehistoric crater lake to envision landscapes one million years in the future.

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