One of the Eight Wonders of Kansas and the first official National Natural Monument these stark formations look like nature's Stonehenge.

A natural spring situated on the grounds of the Hawthorne estate.

Extraordinary objects lurk in this quintessential regional museum.

Every autumn, this grove of living fossils erupts in a blaze of brilliant golden-yellow leaves and stinky fruit.

An eponymous directional signpost erected by the first president of the United States.

Outsider art meets paleontology at this roadside reptile repository.

Once America's tallest structure, now a Baltimore landmark.

An eerie, abandoned military base engulfed by nature and graffiti is now home to a local park.

A beautiful hidden gem in central West Virginia.

Spectacular mineral formations fill these caves, which have been used for everything from smoking meat to stashing illicit liquor.

A dozen U.S. presidents have stayed at the historic resort, which was known as James Buchanan’s “Summer White House” from 1857-1861.

This titanic java kettle is one of the many kitschy landmarks located along America's OTHER famous highway.

This Art Deco service station has been providing tune-ups and turning heads for close to a century.

Berkeley Springs State Park boasts the nation's only monument commemorating presidential bathing.

The first blast furnace in the United States that used coal and coke fuel instead of charcoal to make pig iron.

This university transit system is a 1970s vision of the future.

Washed out by the Johnstown Flood in 1889, the surviving portion of the original two-span bridge now resides at Fishing Creek.

The final resting place of an iconic drag performer is decorated with pearls and hot-pink lipstick.

Maryland's first (and last standing) toll house on America's first federal road established the state as the "Gateway to the West."

Once a thriving business district, this former shopping area is now an urban ghost town in the heart of the city.

Once part of a dam servicing an early 19th century grist mill, the tucked-way falls are a tricky-to-find urban oasis.

A cave on the Maryland border where civilians took refuge during the bloodiest battle of the Civil War.

The land is home to swimming ponies and a legendary 18th-century treasure.

A pair of giant roadside arrows are all that remains of a former Route 66 trading post.