This roadside wonder is as mysterious as it is beloved.

Formerly the world's largest, this Willy Wonka-esque contraption runs 24/7.

This Las Vegas casino boasts one of only three spiral escalators in the United States—an engineering wonder.

Back in 1952, you could get a mushroom cloud chaser with your atomic cocktail.

A tunnel with windows, so you don't miss out on the impressive views.

A sharp bend in a dramatic river canyon cut through red rocks.

A spiritual vortex among the red rocks in Sedona.

This sinkhole in the Arizona desert is filled with carbonated, arsenic-rich water

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

A century-old hotspot for jazz, frequented by everyone from Charlie Chaplin to Al Capone.

The buildings around this DePaul University statue create an echo chamber for those standing in the center of the circle.

In a quiet north Chicago neighborhood rests a stunning relic of the golden age of earthenware design.

Kwanu'sila the Thunderbird has been silently watching over Chicago for more than 100 years (kind of).

A journey begins with a single step, and for many, the road-trip of a lifetime started at this Chicago intersection.

The miraculous hydrant that saved the Mission District in 1906.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

This private residence was the template for one of the most beloved television homes of all time.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

Legend has it the commander of the defenders drew a fateful line in the dirt with his sword just before the final battle.

The former home of Samuel Clemens and family remembers the happiest period of the author's life.

This lovely hilltop tower was specifically built to withstand 100 MPH winds.

A former copper mine which became a truly unsuccessful prison.

Touching mementoes from those who didn't make it back from World War I still hang in one of New York's oldest bars.