These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

A curious cave church carved into the face of a cliff.

This famous city eluded concrete detection until the early 2000's.

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

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

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

This spectacular mosque houses the second-largest chandelier in the world.

The enormous diamond-shaped building packs a trove of academic and literary treasures into one futuristic space.

This fountain pays homage to Qatar's history of pearling, the primary industry before oil.

Qatar's oldest market can trace its origins back more than a century.

The building is a gigantic piece of art inspired by the shape of a desert rose.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

Once the home of a hermetic monk, this cave now houses a small church.

When the USA donated cement and funds to expand the airport in Laos, the Laotians built a massive monument instead.

This tiered waterfall is so pretty it may cause visitors to cry tears of their own.

Climb to the top of the world's largest seated bronze Buddha.

Teeming with illegal goods and services, this towering maze of vice is also a popular tourist accommodation.

Khmer Rouge's high security prison.

One of the biggest markets in Asia, under one of the continent's largest domes.

5,000 skulls in memorial to those killed by the Khmer Rouge.

A battle between nature and architecture in the Cambodian jungle.

This 16th-century monastery was founded to cloister the daughters of wealthy local families.

Built on the remains of one the Incas’ most important gathering spots, this square keeps the spirit of a fallen empire alive.

An Inca spa, military outpost or maybe… both?