Hiding in plane sight.

This saltwater swimming pool, which is the last of its kind in the United States, is slowly crumbling within sight of multiple high-end beachside hotels.

Edgar Allan Poe's old dorm is now a shrine to the author's legacy.

House used in the 1971 horror film "Let's Scare Jessica to Death."

Washed out by the Johnstown Flood in 1889, the surviving portion of the original two-span bridge now resides at Fishing Creek.

Haunted Victorian house that inspired a legendary "Ghostbusters" court ruling.

Infamous marsh filled with toxic waste, World War II-era London rubble, and dead mobsters galore.

The world's only surviving heavy cruiser has a haunting history.

One of the oldest cemeteries in Vermont is the final resting place of soldiers, politicians, and a famous author.

These commemorative stones honor a young woman born in captivity.

Who is this marble man, perpetually creeping up the steps of his own mausoleum?

The monument dedicated to Phineas Gage in the town where his accident happened.

Designed as a place for patients to take in the scenery, this tower has a dark history.

Once the center of food production for this small town.

This cemetery holds the remains of an accused witch and the man that ensured her freedom.

This backwater graveyard in the Hamptons became a trendy burial spot and posthumous status symbol for famous artists.

This giant monument of the RCA mascot is a beloved fixture in Albany, New York.

The first American home of the isolated, egalitarian religion has a trove of Shaker architecture and artifacts.

"A hideous albatross in the Hudson River Valley."

The Hudson River School comes alive at this palatial estate.

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

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

This picturesque cottage was the site of Ulysses S. Grant’s final and perhaps most important campaign.

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