This candy shop has been serving up sweets to the Louisville area since the 1850s.

At the turn of the century, a chair like rock sat at the top of the falls and hosted the winner of a local beauty contest.

The only arched bridge made of stone on the entire Mississippi River.

Once connected to the outside world by a single train track, this ghost town is looked after by the National Park Service.

This museum sits on the site of a decommissioned military communications base.

Nine of the very few concrete ships ever made in the U.S. are beautifully decaying off a Virginia pier.

An alternate history park where the Union Army loses the war... to dinosaurs.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

This maze-like slot canyon is a unique gem within an already fascinating geological area.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

A railroad tunnel that, upon its completion, was considered one of the engineering marvels of the modern world.

This once-palatial plantation may have been the site where a draft of the Declaration of Independence was written.

Paranormal investigators claim this abandoned asylum is the most haunted spot in the eastern U.S.

Heron, whitewater rapids, and urban industrialism all add to the beauty of this concrete nature walk.

This 29-ton granite ball spins around at the slightest touch thanks to a scientific phenomenon.

Comprehensive gaming collection of over 30,000 electronic games and consoles.

An ancient glacial pothole waterfall in the heart of the Green Mountains.

This folk art dinosaur was almost pushed to extinction due to lack of a building permit.

Tour the world's largest deep-hole dimension granite quarry, where you can view the plant where gravestones are made and roll a ball down the outdoor granite bowling alley.

A haunting tribute to pioneering photographer Clover Adams.

A super-sized promotional trick that is now a D.C. landmark.

Government testing at the asylum briefly explored using marijuana as a "truth serum" on Nazi prisoners of war.

The country's oldest continually-operated mini golf course lies hidden in plain sight, eclipsed by one of D.C.'s most popular tourist attractions.

Fittingly, America's museum of architecture is itself a magnificently designed old building.