The true jewel of Africa's west coast known as "Africa's Last Eden."

This neon blue river gets its color from a unique mix of bacteria and volcano minerals.

A dangling church built over a Colombian gorge.

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

Massive sinkholes on a mountain in one of the most remote places in Venezuela.

Sulphuric gases inhabit a beautiful Japanese island.

The second-deepest known cave on Earth, hidden in an extremely remote mountain region.

This series of rope-style bridges brings visitors into a jungle layer that is usually reserved for birds and monkeys.

One of the most remarkable caves in all of Iceland was created by a once raging river of lava.

Hauled from the water's depths, Henry VIII's flagship is preserved in this capsule-shaped museum.

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