Elaborate patterns adorn the city's disappearing traditional architecture.

A nearly abandoned Jewish settlement perched atop a hill in the heart of Yemen.

Yemen's "Stone Palace" looks like it was carved right out of the tall stone column on which it is built.

A mesmerizing reservoir nestled at the heart of a pre-Islamic Yemeni village.

One of the most remote and isolated villages on the Arabian Peninsula.

Reaching the "Church in the Sky" requires scaling the cliff face of a sandstone pinnacle with a 650-foot drop.

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

An ancient Ethiopian cave church is endangered by the simple building of a road.

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

An ocean in the making, in the Ethiopian desert.

The most alien-looking place on Earth.

This stunning waterfall is the backdrop to a site that has seen continuous human habitation for 250,000 years.

The stunningly blue waters of these beautiful caves also have a violent past.

The largest prehistoric ruins south of the Sahara, once a powerful center of international trade.

Fabulous formations, weird and wonderful wildlife.

This granite mountain is the largest rock in Africa and the second-largest monolith in the world.

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

This electric green sulphur lake in New Zealand looks like a cartoonish radioactive dump site.

An enchanting rocky island of scraggly baobabs surrounded by an ancient sea and sprawling salt pans.

Wondrous stalactites house thousands of bats in these African caves.

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.

In Namibia there is an installation that explores the intertwined linguistics and existential beliefs of an imaginary community.

Ancient artists in the middle of nowhere.