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

Human ancestor’s 3.6 million year-old footprints.

This rare volcano spews the strangest and (literally) coolest lava in the world.

Stay in your own little bubble.

A salty red wasteland in Tanzania is a breeding spot for endangered flamingos.

This fortress sits atop a centuries-old well system.

This giant volcanic crater holds its very own field of salt.

More than 100 monumental tombs carved into rock are preserved at this ancient Nabataean site in the Arabian Desert.

Drink and dine in a coral cave that's at least 120,000 years old.

The world’s largest permanent desert lake is a UNESCO World Heritage Site.

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

The skeletal remains of the famous hominid "Lucy" were found at this spot.

An ocean in the making, in the Ethiopian desert.

Massive stele returned to Ethiopia after 70 years in Rome.

An otherworldly restaurant perched on the edge of a jagged cliff next to a medieval holy city.

Ethiopia's "smoking mountain" is in one of the hottest regions on the planet and is home to two lava lakes.

The hottest place on the planet.

An Ethiopian "Jerusalem" featuring a church hewn out of a single rock.

This beautiful waterfall is not easy to reach, but offers a stunning view of the pristine green valley.

An ancient impact crater on the outskirts of Pretoria.

The South African dialect's complex history is immortalized in stone, in one of the world's only monuments dedicated to a language.

Local lore says a serpent-like beast lurks in the deep basin below the falls.

Caves that can't seem to quit producing the remains of prehistoric humans.

This historic observatory was established to keep shipwrecks from littering the Cape of Good Hope.