This crumbling Death Valley mining complex was known for its use of giant, 20-mule team wagons.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

Despite a legend that says this highest peak in Oregon was climbed in high heels, scores of people have died on its slopes.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

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

This impressively large collection includes crackers shaped like Jimmy Carter, Mickey Mouse, and more.

One small town in the Pacific Northwest transformed itself into a Bavarian-themed tourist destination.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

This huge dam across the Colorado River caused an armed standoff between two U.S. states.

The world's largest wooden trestle stretches across this desert canyon in Anza-Borrego Desert State Park.

A world-class observatory in the California desert.

This little blue house pokes out over the campus of UC San Diego, seven stories high.

A couple turned their front yard into an artistic masterpiece.

Quirky castle designed by the American actor best known for portraying Sherlock Holmes on stage.

It's not a typo, now say it five times fast!

A 60-foot-tall tower provides unparalleled views of the southern Green Mountains.

A castle on a hill once named "the most beautiful high school in Massachusetts."

Once a kitschy symbol for a gift shop, this 38-foot seahorse is now a staple roadside attraction.

Marigolds, rosemary, Madonna lilies, and the Virgin’s Bower decorate this Massachusetts sacred garden.

These three lighthouses played a fundamental role in the maritime life of Eastham.

This series of landscape dioramas tell the story of New England forestry in exacting miniature detail.

The largest glacial erratic boulder on Cape Cod.

The longest living non-clonal organisms on Earth.