The most important and best preserved remnant of West Africa's powerful Songhai Empire.

These homes carved into the mountains seem to defy the laws of nature.

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

This whimsically named Vietnamese stream is closer to a walkway than a waterway.

A desert in southeast Asia, complete with a beautiful lake covered in lotus flowers.

Ha Long Bay's "Cave of Surprises" houses a popular phallic rock formation.

A Surreal flight of architectural fancy in Vietnam's Central Highlands.

World's largest cave was only discovered in 1991, and now offers tours to the public.

These crumbling towers are some of the last remnants of a centuries-old Vietnamese culture.

This striking landscape in northern Vietnam contains both geological and archaeological wonders.

A shrine in Karachi is home to around 100 crocodiles that are regarded as sacred.

A 2nd-century stupa home to one of the world's oldest statues of the Buddha.

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

Thousands of ancient rock carvings are scattered just off the highway.

One of the last surviving ancient Buddhist sites in the region, it escaped the brunt of several Hun invasions thanks to its remote location.

A mere stone's throw from Islamabad exists a spectacular display of three millennia of humanity's progress.

Massive fortress bastions in the desert of Cholistan.

Known as the most dangerous bridge in the world, the Hussaini Hanging Bridge is only one of many precarious rope bridges in Northern Pakistan.

A 17th-century mosque that was used for war more than worship.

A place as enchanting as the journey to reach it is harrowing.

One of the largest necropolises in the world is home to a stunning array of historic Middle Eastern tombs.

This grand Pakistani mausoleum can only be accessed via an almost 1,000 foot long alleyway.

The world's second largest salt mine, said to have been discovered by Alexander the Great's horse.

Reputedly haunted sandstone necropolis with exquisite stone carvings.