The central mosque of this Mali town is entirely built from mud.

This park was designated by UNESCO as an Endangered World Heritage site.

A 19th-century architectural masterpiece with ties to Gustave Eiffel.

Morocco's Argania trees are infested with nut-hungry goats.

God's Saharan sandbox of wrath.

Roman ruins, natural methane fires and a lovely beach.

Flames have been burning within this mountain for more than 2,500 years.

The best-preserved ancient theater in the world.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

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

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

A dreamy mausoleum honors Persia's most famous poet.

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

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

Burial site of a Jewish prophet revered in Iran.

This ancient stone bridge is a hub for daredevils.

An ancient fortified mound raised over the millennia from settlements built one on top of the other.

A bloody history is captured in this former prison turned museum.

This lake in northwest Iran has started turning from green to red more frequently than scientists are comfortable with.

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

The largest covered bazaar in the world.

The world's longest nonstop reversible cable car soars through spectacular scenery to the medieval Tatev Monastery.

Right up until the 20th century this network of man-made caves was the biggest village in Eastern Armenia.

A scenic canyon with thick forests and historic ruins.