The headquarters of the Fraternitas Rosae Crucis, complete with Rosicrucian pyramids, all in the Pennsylvania woods.

The shared home of a utopian commune that practiced "free love" a century before the hippies.

A bar, burger joint, and arcade housed in a late 19th-century church building.

Alexander Milliner, a favorite of General Washington, is interred at Mt. Hope Cemetery along with 80 other Revolutionary War veterans.

Stay at this storybook estate, featuring Sir Henry Hudson Kitson's masterpiece "Gingerbread House."

Three acres of mythology-inspired sculptures are visible from the highway.

A whimsical monument deep in this park commemorates the groups that helped build it.

This tiny church near Sleepy Hollow contains Henri Matisse's last work, a rose window, and nine windows by Marc Chagall.

This Catskills museum preserves stumps from the earliest known fossil forest on Earth.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

An enormous cat made of recycled wood scraps.

Eight whimsical acres of metal art.

This one-man homegrown eatery may be the world's most exclusive restaurant with its five-year waiting list.

Why have you never heard of the second most popular tourist site in New York?

This lovely little pond is named after the hundreds of soldiers' corpses that were rolled into the waters during the French-Indian War.

A 13,000-year-old mastodon skeleton was found during the construction of a 19th-century New York mill.

The wooden octagon in which Huckleberry Finn and A Connecticut Yankee were born can still be visited in upstate New York.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

A former mental hospital founded in the 1930s by a eugenicist who advocated for the forced sterilization of patients.

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

Railroad came. People came. Railroad left. Town died.

One man's extraordinary topiary garden in a small South Carolina town.

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

This abandoned school has had many lives since the early 1900s, and all of them doomed.