The deadliest diving spot in the world is also a stunning geological marvel.

Known as the "Valley of the Moon," this Jordanian wadi is one of the most amazing desertscapes on Earth.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

This half-forgotten fortress was constructed by the Ottoman conqueror of Constantinople.

One of the largest wooden constructions in Europe was meant to be a casino, but soon became an orphanage.

The ancient latrines of the Greeks, in all their public glory.

This arch granting triumphal entrance into Antalya was designed to honor the emperor's visit.

Roman ruins, natural methane fires and a lovely beach.

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

This series of Armenian caves held the oldest brain, shoe, and winery in the world.

The most visited pilgrimage site in Armenia once held a saint in a pit for 13 years.

This Armenian monastery was carved out of cliffs and named after the spear used to stab Jesus.

A geological oddity topped with a 2,000-year-old pagan temple.

A literally moving statue of stacked metal giants just continually trying (and failing) to find love.

Fortified homes of highland warriors that are still in use today.

Take respite inside this jaw-dropping church while climbing the volcano where Georgia's Prometheus was once chained.

A cluster of historic bathhouses built on the famed hot springs that gave the Georgian capital its name.

This extraordinary, multi-pillared monument depicts the fascinating history of Georgia.

Home to nearly a third of the world's mud volcanoes, Azerbaijan is home to a messy, bubbling, and sometimes explosive landscape.

A massive collection of petroglyphs dating back some 40,000 years.

Mysterious hillside with a continuously burning natural fire.

A shrine of fire worship built on top of a natural flame.

Foreign invaders almost left this lovely Caucasus palace alone—almost.

The largest covered bazaar in the world.