A sharply wedged sundial marks the point at which each day in the United States begins.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

The same security that protects our nukes accidentally protected a gentle herd of antelope.

The world's largest mineral hot springs is home to a herd of bison, a free public bath house, beautiful mineral formations, and a terrifying swinging bridge.

A small Wyoming town is home to the state's oldest-operating soda fountain.

Locally known as the "Onion” and the "Egg Beater,” Casper’s most recognizable buildings are beloved local landmarks to many, and eyesores to others.

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

A hidden courtyard houses early 20th-century plaster masterpieces.

An extraordinarily ornate museum in San Diego holds wondrous anthropological treasures.

This more than a century-old cathedral has seen its fair share of redesigns over the years.

A small collection of iguana-infested ruins hides amid Cancún's bustling hotel zone.

This erect, phallic geological spire wasn't always named so domestically.

An experimental, automotive replica of Stonehenge.

Long before guestbooks and hotels, frontier travelers signed their names on this rock face.

One of California's oldest continually used high schools has an interesting history, both on and off screen.

Grab a latte at the birthplace of modern American skateboarding.

A second generation sun-powered marvel lights up the night.

A sign at the end of the Santa Monica Pier marks the traditional end of the legendary American highway.

An homage to the man who built California's version of Venice.

60 feet of towering steel balances gracefully.

An historic and oft-filmed spot for musclebound iron pumpers on the Pacific coast.

The Southern California pop sounds of surf and sand were born right here.

A giant donut stands as a popular symbol of Los Angeles iconography.

This monster board rode a monster wave to break two world records.