Water

Once a year, ambitious surfers can ride the world's largest river.

This annual Belgian water race attracts bathtub captains from all over the world.

A stunning, abandoned limestone quarry in southern Indiana provided the stone to erect the Empire State Building.

A man-made island in scenic San Francisco Bay.

Once thought to be the mysterious work of a witchy prophetess, a well with unusual properties turns objects into "stone".

A Roman-inspired temple once controlled half of San Francisco's waters.

One of the deepest indoor swimming pools in the world.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

A series of waterfalls so massive they straddle the border of Argentina and Brazil.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

Community owned and operated, this property is home to a diverse set of nudists.

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

One of the deepest blue holes in the world.

Legendary private island in the Bronx...devoid of rats.

Handcrafted thermal spa washes away each night with the tide.

An eatery in a shallow river where diners can enjoy their meal mere feet from the base of an artificial waterfall.

This naturally-sourced hot spring is now home to a clothing-optional resort.

Iceland's largest lagoon is home to stunning multi-colored icebergs.