Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

An abandoned stretch of highway, deteriorating next to the operational one.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

Where America's first doomsday cult awaited the end of the world.

A toxic ghost town sitting atop a massive coal fire.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

World's first "penitentiary," meant to be humane, drove men insane.

A heartwarming message to those entering and departing Music City from above.

The alley connecting two of country music’s most historic venues has a rich history of its own.

This popular park is home to a sea serpent sculpture that now overshadows the twisted history of its creation.

The grave of America's 11th president is not in some grand monument but instead it's hidden away on the grounds of the Tennessee Capital.

One Confederate statue that accurately reflects the ugliness of its subject.

This defunct, fortress-like prison has been the setting for several movies.

At 135 years old and counting, this historic print shop is heaven for poster nerds and music buffs.

This replica of the Greek structure is in the heart of Nashville.

This shale formation along the Appalachian Trail once inspired the third president of the United States.

A lighthouse on this West Virginia lake started as a joke, then the forces of nature helped make it a reality.

This lookout tower built in the 1930s is now an in-demand cabin with what might be the best view of the Seneca State Forest.

This former fire tower is now a rustic observatory that offers amazing views of eagles, hawks, and the Appalachian Mountains.

A beautiful hidden gem in central West Virginia.

This former fire tower found new life as a communications hub complete with a scenic overlook.

A well-preserved relic of the industrial age steel and iron works that dotted West Virginia.