The longest continuous lava tube in Oregon.

Atop an active stratovolcano, two lakes separated by a narrow strip of land.

Mining caused an asbestos emergency in this small town.

Spectacular views await visitors to this lake.

A beautiful 62-acre Catholic shrine and botanical garden.

I Street Bridge is the heaviest swinging center bridge in the United States.

Art Deco stylings conceal the true nature of this bridge.

A replica of the first public theater built in California.

The California capital city once stood 10 feet lower than it does today.

Where the first "expert riders, willing to risk death daily" for the Pony Express were recruited.

The highest point in Washington state is a volcano covered in glaciers.

One of the largest fleets of armored vehicles in the world, sitting out in the California desert.

A large lava tube that can be walked through with no special equipment.

The first radio telescope dedicated to the Search for Extraterrestrial Intelligence.

A whimsical display of massive metal sculptures made from recycled materials.

The flow from this waterfall sometimes comes out of springs below its rim.

At the edge of the high desert, California's second-largest natural lake is home to a unique subspecies of trout adapted to its alkaline waters.

What began as a prominent Burning Man art piece is now an iconic symbol of downtown Reno.

This 18-foot-tall steel lotus is a meditation on ecological crisis that originally appeared at Burning Man.

Millions of dollars worth of sculpture decorate this Iowa city center.

The magazine keeps a perfectly groomed display garden for its photo shoots.

The only female equestrian statue in Washington, D.C. is a 15th-century French heroine.

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

A gorgeous mural outside a beloved D.C. restaurant pays homage to famous Black Americans.