This national landmark is also home to a massive treehouse.

Where the oil industry began.

Designed by Horace Trumbauer in 1893, this Gothic-style castle is now a home for academics.

The rock on which Moll Dyer was found frozen to death is said to still bear her handprint.

In what is rumored to be an intentional act of spite, this memorial almost completely obscures the nearby grave of a senior officer.

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

A eight-foot-tall statue resides in the heart of Pennsylvania anthracite coal country.

These hooded graves are the only of their kind in the United States.

This lush forest valley was once mined for lumber to the extent that it was once nicknamed "The Pennsylvania Desert."

This unique creation was made by the largest manufacturer of Christmas bulbs in 1946 to honor those returning from World War II.

A retired firefighter created this contraption so he and his family wouldn't die if accidentally buried alive.

According to local myth this cemetery is half evil spirits, half good—split down the middle.

"A hideous albatross in the Hudson River Valley."

A unique work of art that was created without permission.

A pair of 19th-century granite markers symbolically record where the state boundaries of New York, New Jersey, and Pennsylvania intersect.

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

The building that inspired Shirley Jackson's "The Haunting of Hill House."

The farm where one of America's most famous folk artists created her paintings.

A mysterious echo seems to defy the laws of acoustics.

Of all the unique artifacts inside this library, a mummified hand stands out among the others.

Books you don’t need in a place you can’t find.

The site of the first "historically true" UFO encounter in the U.S.

Dedicated in 1895, this is the world's first tribute to the hardworking newspaper delivery boy.

You can get anything you want at the former site of the restaurant immortalized by Arlo Guthrie.