These beautiful historic watchtowers were used for both scanning the desert for enemy invaders and observing the celestial world.

The largest and, arguably, most scenic fortress in Bhutan.

Strange, gentle beasts resembling goat-cow hybrids roam within this patch of forest.

This sacred, circular cave is lined with pools so clear and still that it's hard to tell where the water begins.

After sunset the heart of Zanzibar's historic Stone Town neighborhood transforms into a culinary playground.

Human ancestor’s 3.6 million year-old footprints.

The largest game reserve in Africa is home to thousands of species but refuses to house humans.

Stunning ruins of what was once the center of one of the greatest empires in East Africa.

Strolling through these vintage locomotives offers a surprising amount of insight into the history of Kenya.

A glass and sculpture wonderland forms an oasis in a remote part of Kenya.

Strange sandstone canyon known as the "place broken by itself."

Get tall with nature's lankiest beasts and their warthog friends at this Kenyan preserve.

A salty cave excavated by elephants and the location of a deadly disease vector.

Abandoned city hidden from the world by tropical forest and isolation on the coast of Kenya.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

Legend has it a commoner volunteered to be buried alive in the foundation so that the great fortress could be built.

Stretching almost 2,000 feet, this painting is one of the longest pieces of Buddhist artwork in the world.

These sacred totem houses connect the Fatakulu people with the spirits of their ancestors.

Ornate, dome-topped cenotaphs fill this royal crematorium.

This ancient structure is widely thought to be the oldest intact pyramid in the world.

This 700-year-old Cyprus castle is the birthplace of the world's oldest wine, said to be toasted by Richard the Lionheart at his wedding.

This small uninhabited island offers Galapagos-like biodiversity.

Robot jockeys ride their humped mounts to victory as part of a 21st-century twist on an ancient desert sport.

Natural cathedral designed by Italian artist Giuliano Mauri.