This salt marsh in Southern France is as pink as the flamingos that inhabit it.

From the sky, a kaleidoscope of color brightens the grey landscape of the San Francisco Bay.

This huge pile of volcanic boulders hides a stunning network of secret grottoes.

A naturally beautiful, seemingly bottomless deep blue spring.

This tiered waterfall is so pretty it may cause visitors to cry tears of their own.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

A solitary tree has grown up all alone on Lake Wānaka, backdropped by the beautiful Southern Alps.

A remote candy-striped mountain in the Peruvian Andes straight out of the pages of Dr. Seuss.

On La Gomera, "Silbadors" communicate in a 4,000-word language of whistles.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

Hundreds of hidden passageways weave through the old quarters of Lyon.

A stairway to heaven, or to nowhere at all.

Elevated freight railway turned wildly successful urban park.

Rippling sand dunes frozen in the Arizona rock.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

Millions of glowing microscopic organisms light up the waters of this luminous lagoon.

Submerged trees jut ghost-like out of an idyllic turquoise mountain lake.

A Netherlands hotel where you can sleep inside a wine barrel.

This national park on the shore of Lake Michigan features remarkable dunes that lie at the heart of a Chippewa legend.

The remains of a sunken military ship wreck visible through clear water.

This subterranean disco dance club in a Cuban cave comes with bright lights and a dark legend.

Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."

Finale of "William Tell Overture" can be heard as drivers pass over grooves in the road.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.