Rimmed by white crusts of salt on every edge, Lac Assal is one of the saltiest bodies of water in the world.

The most alien-looking place on Earth.

Though strikingly beautiful, Seattle's other railway station is now largely forgotten.

This remarkably well-preserved mosque stands amid an 11th-century caravansary.

Thousands of colorful pirogues showcase ingenious craftsmanship at the largest fishermen port in Nouakchott.

The quaint gallery displays works by artists from all across Mauritania.

Climb atop one of the world's longest and heaviest trains for an unbelievable journey across the Sahara Desert.

Five ancient libraries, little changed for centuries, preserve a medieval archive of Quranic lore and civic documents

A geological bull's-eye visible from outer space.

The world's largest ship graveyard is the product of decades of corruption.

An awe-inspiring mosque in Morocco with one of the tallest minarets in the world.

The rubbery beast is sculpted from recycled materials.

Bizarre living fossil only grows in a small chunk of the Namib Desert.

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.

This small monument marks the divide between the Atlantic and Indian Oceans at the southernmost tip of Africa.

A sobering account of the vibrant multicultural neighborhood that was destroyed under apartheid.

Formerly known as the Malay Quarter, Bo Kaap is a colorfully-painted suburb located in the “Mother City” of South Africa.

This African beach is home to thousands of rare mainland penguins that are known for their annoying voice.

These Nubian pyramids are strange and unique, even by pyramid standards.

This mysterious but iconic tapered tower appears in many Azeri fairytales and legends.

Resonant stone, that has been played since prehistoric times.

A shrine of fire worship built on top of a natural flame.

Mysterious hillside with a continuously burning natural fire.