A 1,500-year-old, 3-story subterranean city where ancient Persians took refuge in times of war.

These memorials built by an eccentric bachelor on the side of Interstate 5 cause both wonder and traffic accidents.

An underappreciated sculpture garden just a few blocks from the capitol building.

A 24-hour vending machine restocked daily with homemade full-sized pecan pies.

This collection of ferns from across the globe is the largest assortment in the United States.

The beautiful 1920 Pantages Theatre remains hidden just underneath the LA Downtown Jewelry Exchange.

The empty tomb that houses the memories of Roy Bertelli's revenge.

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

The final residence of an educator, civil rights leader, and presidential advisor was also the first headquarters of the National Council of Negro Women.

A museum dedicated to the former country.

The only building in Louisville (hopefully) that contains two ancient holy skeletons.

The grave of the iconic Kentucky Fried Chicken mascot features a bust of the man behind the goatee.

The home for all things Kool-Aid offers everything except a chance to actually enjoy the drink.

Nevada's largest cactus collection stands outside a candy mogul's small factory.

An alluring, arid botanical garden home to a bewildering variety of cacti both endangered and common.

Traversing these canyons, visitors can take in stunning views and glimpses of the region's history.

Explore the wide world of desert plants at this unique Palm Springs botanical garden.

This ornate English estates "Prodigy House" still bears the cannonball marks of civil war.

When it was built in 1929, this historic bridge was the only place to cross the Colorado River for 600 miles.

Before Nixon, "watergate" meant canals.

The former home of Dr. E.B. Henderson, also known as the "Father of Black Basketball."

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

This historical art colony is adorned with thousands of hand-carved concrete sculptures in the Mayan Revival style.

This long-abandoned village sits across a narrow gorge from a still-inhabited settlement that was once its twin.