In September 1974, a small group of athletes completed the first modern triathlon event in San Diego's Mission Bay.

A sculpture of the famous photograph stands on San Diego's "Greatest Generation Walk."

A wild west cemetery in Tombstone, Arizona, provides a window into the Old West.

This curiosity shop contains a museum filled with bizarre, unique objects.

An old saloon in the West filled with history, and according to some, a few dozen ghosts.

A reproduction of earth's many biomes.

Commercial aircraft storage facility, where you can see a TWA 747.

Take a monster truck tour around an ostrich farm in the middle of the desert.

Millions of years of erosion created the feature for which this rock formation is aptly named.

The historic “pink house on the hill” is an architectural gem that now serves as a center for water conservation.

A geological mystery on Camelback Mountain.

Originally conceived as part of a proposed Arizona State Capitol building in the 1950s, this structure built in 2004 stands as a monument to the architect's legacy.

The largest natural travertine bridge in the world is nestled in a small canyon in central Arizona.

These free-roaming horses were once destined to disappear from the land.

An ambitious developer built what was once the world's tallest fountain in a Phoenix suburb.

This abandoned horse racing track was an exercise in hubris from its inception.

Home to the deepest rift anywhere on Earth.

These falls, sometimes called the "Niagara of the West," still put on a good show at the right time of year.

The only bridge in the United States where BASE jumping is legal without a permit year-round.

Some 46,000 years ago, a volcanic eruption led to a flooding event that carved this short canyon with steep vertical walls.

An ordinary rancher stumbled upon one of the world’s largest collections of Pliocene horse fossils.

At the site of the most dangerous crossings on the Oregon Trail, a museum explores the complex history of westward migration in America.

One of the largest collections of wildlife art in the United States, built into the side of a cliff in rural Wyoming.

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