These roaring primates were considered a divine creature in the cosmology of the Maya.

Monkeys inhabit the lush forest surrounding ancient Mayan ruins once considered sacred.

Sparkling, calcite-covered skeletons of children who may have been sacrificed to appease an angry god.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

Golden Gate Park's historic collection of plants.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

Centuries of crashing waves carved out this small hole in the rock, which lights up at certain parts of the year.

Located in the remote Monitor Valley, this travertine bowl contains a scalding pool of water.

Many generations of travelers have passed through the steep, smooth walls of this canyon.

A natural dome made of volcanic glass in Inyo National Forest.

Singing sand that stands as the final remains of an ancient lake.

Once thought to be the oldest living tree in the world, Methuselah was germinated before the Egyptian pyramids were built.

Eons old volcanic activity created one of the most stunning rock formations in the United States.

In 1954, two enormous earthquakes occurred just minutes apart, resulting in prominent scarps that extend for miles along the range fronts.

A gothic palace of endless stalagmites and pseudoscorpions waits within one of the world's most beautiful caves.

One of the most unusual geological features, recognizable from a dozen hit movies.

Millions of years of oxidation make a drive down this winding Death Valley road surprisingly colorful.

The rocks in this arid basin leave trails of movement behind them.

This central Nevada cave is the spiritual home of ancient and enigmatic pictographs.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Towering basalt columns, a creation of fire and ice.

Despite being a perfectly pleasant place to be, Loyalton can't seem to attract any visitors.

A popular tourist cave with a dark past.

Its dark depths conceal millions of rare, delicate crystal formations.