One of Chile's most active volcanoes is riddled with beautiful caves.

The colorful soil of Iran’s "Rainbow Island" attracts artists and nature lovers.

One of the only places where Earth’s mantle lies above water.

Named for the DeFoe novel inspired by a stranded sailor, this island is known for its rare plants and extreme beauty.

Considered the most remote point in the entire world.

Naked scientists race around the pole in the frigid cold to try to join Antarctica's exclusive 300 Club.

The largest piece of no man's land left on Earth.

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

Constant erosion has created a surreal landscape of bleached and preserved fallen trees.

This serene, turquoise lake in an extraordinary nature reserve showcases a rare natural phenomenon.

The most remote tree in the world is more than 170 miles from its nearest neighbor.

These abandoned huts still hold the remains of an early 20th century Australian researcher's work.

A commemorative plaque hides a door that leads down to the New York Public Library's underground book bunker.

A castle hand-built by a Spanish dreamer in the Australian tropical jungle.

White cockroaches and other cave species occupy this massive series of lava tubes.

A series of sculptures beneath the waves promote ocean conservation and support coral reefs.

The chefs at El Diablo use heat generated by an active volcano to cook the food.

Visit a surreal landscape so otherworldly NASA actually used it to train the Apollo 17 crew.

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

Two ancient Buddhist temples crown this dramatic rocky pinnacle.

Bali's remote "gateway to heaven" is one of the most sacred places on the island.

This underwater sculpture park is the basis for a manmade coral reef.

Once a meeting point for great thinkers, and the midpoint of the country.

Sometimes called the Banksy of Madrid, Muelle was a pioneer of street art in the Spanish city.