An artsy hidden staircase leads to breathtaking views of San Francisco.

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

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

The only visible piece of San Francisco's most famous shipwreck.

The first AIDS memorial chapel in San Francisco and one of only a few in the U.S.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

An optical illusion found amid a logged redwood forest.

Two mammoth statues inspired by equally tall tales lure tourists to this roadside attraction.

Commonly referred to as the most photographed Victorian home in the United States.

Canyon walls shrouded in ferns.

Stroll through a wonderland of stupendous moss-covered trees.

Rustic natural hot springs in the deciduous rain forest.

This sci-fi gazebo located in a Washington power town is made from old bits of industrial electrical equipment.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

This amazingly preserved Gold Rush town is a historian's dream.

A smoke stack so large, the Washington Monument could fit inside!

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

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

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

This rustic old building is said to be the most photographed barn in America.

The first declared National Monument in the United States.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

Dramatic river bend surrounds a natural red-rocked pedestal.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.