Mined to a depth of 240 meters with a perimeter of about 1.6 km, the largest hand-dug excavation in the world.

Fascinating collection of Khoisan rock engravings, still situated in their original setting.

Hidden in the hills is a mysterious stone structure, known only to a few.

A South African bar inside a hollowed out 6,000-year-old Baobab.

Unexplained bald patches in the landscape grow and recede over time, as though they are somehow alive.

This "dead marsh" sits among the largest sand dunes in the world, a forest frozen in time.

A desert that rolls right up to the ocean, where it's so dry animals live off the fog.

Dolphins, ancient clams and hundreds of waterfalls make this one of the world's top tourist destinations.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

An incredible menagerie of more than 3 million taxidermied animals at the oldest science museum in Europe.

The lab where the scientist made his groundbreaking discoveries is preserved on the basement floor of the Faraday Museum.

Rich red almandine gemstones are waiting inside the volcanic rock strewn across this eastern Nevada hillside.

High plateaus and beautiful waterfalls frame this ecologically significant nature preserve.

A tiny, remote island packed with wonders both natural and geeky.

A seemingly endless landscape of pure salt stretches far across Bolivia.

This grove of ghostly cedars was killed in 1700 by an enormous tsunami, felt from the United States to Japan.

Rising out of miles of farmland, these buttes are sometimes called the world's smallest mountain range.

World's first "penitentiary," meant to be humane, drove men insane.

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

Dr Barnes' $25 billion private collection of art and arboretum.

A rare view of a preserved Victorian science museum.

Known as the "Dodo Manège," this carousel features a herd of animals that have disappeared—or may be gone soon.

A remnant from the golden age of aviation still in use today, Pan Am's Clipper service took off from this Art Deco gem.

One of only two commuter aerial tramways in the United States.