The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A beautiful geyser under environmental threat.

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

This spot along the 23.5 degree north parallel marks the northern boundary of the tropics.

This bazaar is one of the oldest in the Arabian world.

This spectacular mosque houses the second-largest chandelier in the world.

The Fun Farm weaves fairy tales, myths, and magic into a magnificent collection for visitors to explore.

For centuries, Jeddah’s old town was a major trading port and a point of entry for Hajj pilgrims traveling by sea.

The busy transport hub is home to the tallest airport slide in the world.

One of the largest bamboo bridges in Asia, located right next to a bamboo school.

This tiny lake temple dedicated to a water goddess seems to float on the surface.

Hindu temple of the dead home to hundreds of long-tailed macaques.

Get tall with nature's lankiest beasts and their warthog friends at this Kenyan preserve.

Just outside of Nairobi lies a large estate surrounded by endangered Rothschild giraffes, who have been fed from the window by Mick Jagger and Walter Cronkite.

Eighty million natural history specimens call this gargantuan museum home.

Though many were skeptical at first, these animal-specific routes across the Trans-Canada Highway have been a major conservation success.

A narrow, serpentine spit of sand is constantly eroded and rebuilt by competing currents.

Jumping-off point for a climb up Mt. Everest is the most dangerous airport in the world.

One of its engravings is believed to be among the first representations of medical and surgical instruments.

This ancient structure is widely thought to be the oldest intact pyramid in the world.

An endless sea of white conical domes.

Ozymandias’ time-keeping temple.

Golden Gate Park's historic collection of plants.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.