At this farm in upstate New York, the former president plotted his reelection campaign.

The schoolhouse where Jesse Merwin, the inspiration for the "The Legend of Sleepy Hollow" character, once taught.

"A hideous albatross in the Hudson River Valley."

The rustic think-space of famed naturalist John Burroughs stands exactly as he left it.

The world's largest kaleidoscope, designed by a 1960s psychedelic artist.

This Central New York ghost town was once a prosperous railroad community.

A mine fire has been burning under the deserted town since 1962, but this church is still going strong.

The only geyser in the state of Pennsylvania is caused by pressure from an abandoned coal mine outside of the ghost town Centralia.

Buildings that dynamite couldn't bring down were abandoned because of bathroom issues.

A train station that was abandoned by the coal industry and was later converted into a cocktail bar.

A small granite block at this monument's base is the only part of Lincoln's Tomb outside of Illinois.

This massive sycamore tree has been labeled as one of the largest in the state.

The beloved, war-tested mascot of a Union regiment graces their battlefield monument.

One of Gettysburg’s least visited battlefield memorials is off the beaten path, but worth a visit.

Home of the only civilian casualty at the Battle of Gettysburg.

A diorama of the Civil War, fought by cats.

Rumors persist that a bottle of whiskey is sealed within this Demijohn-shaped adornment.

A mountaintop space observatory that is certified dark.

This small beachside park commemorates the possibilities of discovery.

Believed to be haunted, this old cemetery is beautifully adorned with Spanish moss hanging from the trees.

A Florida college boasts the world's largest single-site collection of structures designed by Frank Lloyd Wright.

In a time before lifeguards, this house was a sanctuary for the shipwrecked.

Two men built this castle on the Florida coast as an artistic “landscape sculpture.”

The smallest post office in the United States is no bigger than a broom closet.