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

Brightly painted boulders scattered throughout the Sinai Desert.

New fungal and bacterial species call this deadly lake home.

Fire meets ice at the southernmost volcano on Earth.

Extraordinary rock formations in open Peruvian fields.

Home to nearly a third of the world's mud volcanoes, Azerbaijan is home to a messy, bubbling, and sometimes explosive landscape.

Giant granite rocks standing end-to-end like a train of circus elephants.

The world's first and only natural nuclear reactor.

Conifers from the Jurassic Period transformed into stone in Patagonia.

Britain's oldest and biggest hole in the ground.

This naturally heated mountainous creek has created a group of neon blue pools of potentially deadly boiling water.

This "floating island" plateau sits 7,671 feet above the forest floor.

A botched 18th-century canal silenced one of Sweden's most magnificent waterfalls.

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

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

An artist's vision for connectivity spans seven continents and 16 countries.

A remote forest of stone pillars along the Lena river.

Towering basalt columns, a creation of fire and ice.

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

Rippling sand dunes frozen in the Arizona rock.

Some of the clearest water anywhere in the world.

This strange geological landscape erupts with sudden bursts of water.

The Dalai Lama named this New Zealand landscape the "Spiritual Center of the Universe."

A perfect turquoise lake colored with glacier dust.