World's largest cave was only discovered in 1991, and now offers tours to the public.

This deceptively salty lake looks like blushing pink lemonade.

This beautiful natural train tunnel is said to grant the wishes of visiting lovebirds.

An exquisite tunnel of cascading flowers.

A cave's rare beauty held a cavernous secret hidden underground.

65 million-year-old chalk outcroppings mark the end of the Jurassic Coast.

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

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

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

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

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

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

A 30-acre garden inspired by the principles of modern physics.

Rippling sand dunes frozen in the Arizona rock.

Futuristic apartment blocks are the backdrop for Montreal surfers hangin' ten on the Habitat '67 standing wave.

England's most notorious suicide spot.

Surreal riveted sea forts once protected the Kent shores from German attack.

A reproduction of earth's many biomes.

An enormous concrete structure built over a nuclear crater.

This "preacher's pulpit" once used for pagan ritual, is home to a new, and dangerous ritual.

Massive fortress bastions in the desert of Cholistan.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

The world's second-largest sundial, made entirely out of stone.

A series of five defunct panopticon prisons in Cuba.