An isolated dive site teeming with cnidarians.

This portion of a lovely Belize beach is infested with (harmless) sharks and rays.

Though its celestial ceiling is impressive, the true star is the vast collection of French books.

A miraculous natural phenomenon known as "the spring that breathes."

Despite a legend that says this highest peak in Oregon was climbed in high heels scores of people have died on its slopes.

The highest point in Washington state is a volcano covered in glaciers.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

This stunning mass of ice spans 121 square miles and is still growing.

South Korea's love of the silly photograph is on full display at this goofy collection of trompe l'oeil paintings.

The latest in a series of long glass bridges suspended at terrifying heights.

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

In paradise, feral pigs have claimed an island all to themselves.

This crescent-shaped sliver of sand is a magical haven for a herd of feral horses.

They squeal, they nosh, they look like predators.

Olfactory delights in San Francisco's Botanical Gardens.

A glacier pocked with ice caves and surrounded by rainforests.

A perfect turquoise lake colored with glacier dust.

Dolphins, ancient clams and hundreds of waterfalls make this one of the world's top tourist destinations.

Tubing through a cave lit with glowworms is a magical underground experience.

A geological oddity topped with a 2,000-year-old pagan temple.

The most visited pilgrimage site in Armenia once held a saint in a pit for 13 years.

Sacred Buddhist home of some spiritual monkeys.

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

Where dogs like the rare "Fire-Tailed Border Cocker" run free on the mountainside.