A fantastical group of cliffside stairways, bridges, and twisting paths carved out of stone provide a surreal coastal hike.

Enormous underground chamber built to detect 'ghost particles' of the universe.

A beautifully eclectic mix of architectural styles.

Museum preserving torture methods from the past.

A fifth-century temple improbably built into the side of a cliff.

The tallest stationary dunes on Earth also happen to sing.

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

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

An abandoned saucer-shaped monument in the Bulgarian mountains.

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

A city built from mud and known as the "Manhattan of the desert."

The convergence of two currents makes this a surprisingly pleasant getaway in the Arctic Circle.

The most alien-looking place on Earth.

Stepping away from the glitz of mobsters and casinos to learn about the other history of Vegas.

Eons ago, a rushing lava river formed this pristine passage through solid rock.

Death road of Bolivia.

Bolivia's needle-like rock formations.

On the outskirts of a desert trading village high on the Andean plain, steel giants have been destroyed by salt winds.

Towns with a resource known as "white gold," valuable enough to fight a war over, now stand ghostly and empty.

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

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

This dramatic sea spire is home to the world's rarest insect and is part of the lost continent of Zealandia.

Museum celebrating the ocean, with the largest wunderkammer dedicated to sea exploration.