A perfect turquoise lake colored with glacier dust.

Dolphins, ancient clams and hundreds of waterfalls make this one of the world's top tourist destinations.

Originally slated to become a luxurious resort, this structure is now a graffiti haunt reclaimed by nature.

The world's largest wooden structure.

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

Neon artworks light up this dark Edinburgh tunnel.

The rusting remnants of a flying boat lie scattered near the site of its fatal crash.

The ruins of a defunct limestone quarry still haunt this Scottish promontory.

This Shetland Islands bus shelter may be small, but it squeezes in a couch, a desk, some art, and even an old telly.

This 1967 experiment in modular architecture was designed to be a new model for urban living.

Accessible only by boat, this centuries-old island fort never saw troops or combat.

Run by members of the Tohono O'odham Nation, this community farm nurtures traditional desert cultivars.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

This dizzying span over the ancient Algerian city was once the highest suspension bridge in the world.

This vertical pinnacle in China was the inspiration for the floating mountains in the movie “Avatar.”

Frida Kahlo's childhood home, now a museum of her life and works.

At 705 feet high, Brazil's "House of Stone" is the largest cave mouth in the world.

Bolivia's needle-like rock formations.

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

Mysterious Incan ruins on a tiny island in Lake Titicaca.

Death road of Bolivia.

This lake’s emerald green waters are a spectacular sight, but it’s not a great place for a swim.

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