Dramatic river bend surrounds a natural red-rocked pedestal.

A beautiful 62-acre Catholic shrine and botanical garden.

This scalding hot river was thought to be a myth until one geoscientist made it his quest to study the mystical waters.

Natural stone arches form a walkable "cathedral" at low tide, then disappear entirely when the water returns.

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

Fine dining 20 feet below the surface in the Indian Ocean.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

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

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

One of the few remaining American elm trees in New York’s Tompkins Square Park was the birthplace of a new religion.

This peculiar lake of pitch is so thick and viscous that one can walk on its surface.

An underwater restaurant, surrounded by a coral reef.

Roman ruins top white travertine terraces formed by ancient hot springs.

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