148 feet long and in the middle of a verdant forest.

A graceful natural rock formation stands astride the point where the Gulf of California meets the Pacific Ocean.

Over thousands of years, this slot canyon was carved out of the bed of an ancient lake.

These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.

The Grand Canyon of Texas.

Eastern zen meets Western grit in these four little trees growing out of a rock on Lake Tahoe’s Nevada shore.

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

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

Legends surround this jagged rock formation in the New Mexico desert.

These black pillars of volcanic basalt seem to call mountain climbers with an unbreakable siren song.

Most-visited and most-photographed slot canyon in the American Southwest.

Dramatic river bend surrounds a natural red-rocked pedestal.

999 stairs lead visitors through a massive hole in a mountain known as the Gateway to Heaven.

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

A grove of "candelabra redwoods" deep in California's Lost Coast.

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