The secret city built by the Manhattan Project.

These early tent-shaped grave coverings are unique to Appalachia.

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

In 1869, Swiss and German immigrants settled in this small town in the mountains of West Virginia.

The world's largest fully steerable radio telescope.

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

Home of a 28-foot tall stalagmite known as the War Club.

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

This abandoned amusement park was built on a site with a dark history.

Take a steam-powered ride straight out of the past on this Appalachian rail line.

Despite its lavish ornamentation, and wholesome lifestyle of its devotees, this mountain commune has faced its share of issues.

America's post-nuclear-attack chambers of Congress.

Hikers can still stroll beneath the long conveyer of this abandoned mining facility hidden in a West Virginia river gorge.

Beyond the usual stories that attend old prisons, this one has deep bloody undercurrents.

The "mysteries" of this quintessential roadside oddity were almost destroyed by neglect but were saved by fans of kitschy wonder.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

This functioning mill was built in the 1970s using parts from several other West Virginia mills.

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

Classy up your Big Mac with bow-tied servers and chandeliers at the world's fanciest McDonald's.

It's where the final scene of the beloved Tom Hanks movie was filmed.

An ideal wedding spot that is almost too ideal.

These eerie outliers of the lightning bug family glow a mysterious blue color.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.