A desert that rolls right up to the ocean, where it's so dry animals live off the fog.

This awesome Spanish castle is so fantastical it was actually used on Game of Thrones.

An unfinished tomb carved into a giant boulder in the Arabian Desert.

This stunning Brazilian library contains the largest collection of Portuguese texts outside of Portugal itself.

A gravity-defying "devil's bridge" that has a surprising architectural feature for its stability.

Turnip-shaped island just off the Michigan shore in Lake Huron.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

Eons old volcanic activity created one of the most stunning rock formations in the United States.

Canyon walls shrouded in ferns.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

Most-visited and most-photographed slot canyon in the American Southwest.

Rising from the sea like a stone monster.

Towering basalt columns, a creation of fire and ice.

Rippling sand dunes frozen in the Arizona rock.

This "dead marsh" sits among the largest sand dunes in the world, a forest frozen in time.

This wondrous waterfall rushing down a green-covered mountain wasn't discovered until 2010.

Submerged trees jut ghost-like out of an idyllic turquoise mountain lake.

Stunning wetlands ablaze with pink lotus flowers.

Iran's colorful terraces are a rare geological masterpiece.

This abandoned fishing settlement may well be the greenest village in the world.

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