Astronomical observatory above Lake Titicaca.

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

A valley of unique erosion patterns lends to a view like nothing on Earth.

This red lake 4,000 meters above sea level is home to rare flamingos.

An abandoned mountain village in Habib surrounded by walnut, apricot, and pomegranate trees.

The biggest cave system in the Arabian Peninsula is home to a rare variety of blind fish.

The ruins in this village were caused by something more sinister than neglect.

A section of the desert with an array of unusual sandstone and limestone formations.

The best-preserved beehive tombs in Oman with spectacular backdrop.

Take the most scenic fjord landscape in Norway and add dramatic red cliffs, warm clear water, and playful dolphins.

This beautifully restored fortification kept the city safe for centuries.

Traditional architecture and ancient irrigation systems are on display in this gorgeous mountain village.

This lonely tomb is all that remains of a once-bustling ancient trade hub visited by Marco Polo.

These gnarly desert trees produce the prized aromatic resin traded along the ancient incense trail.

Groups of prehistoric tombs that dot the mountains of northern Oman.

This bazaar is one of the oldest in the Arabian world.

An imposing Omani fortress surrounded by date palm trees.

A sinkhole and now a swimming hole, too, full of dazzling turquoise water.

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

One of Yemen’s oldest and most beautiful mosques was named for the incredible, historical queen buried inside it.

This impressive system of tanks was used to store drinking water as long as 2,000 years ago.

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

Elaborate patterns adorn the city's disappearing traditional architecture.

The most alien-looking place on Earth.