The kind of mixed-up place that drives archaeologists crazy.

This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.

The graves of a Connecticut family thought to have been plagued by a vampire.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

Blighted Irish field and the ruins of a 19th-century cottage on the edge of urban Manhattan.

These unassuming lighthouses have seen the first reading of the Pledge of Allegiance, the first wireless transmission, and more than one mystery.

A 19th century library favored by Edgar Allan Poe and H.P. Lovecraft, known by locals as "the Ath."

Memorial to one of the most fatal fires in both circus and U.S. history.

The oldest place in Hartford is a cemetery with thousands of bodies stacked beneath the grass.

This historic park site contains the last remnants of a once bustling canal system.

This stunning Connecticut mansion is actually just a one-room-deep hoax.

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

American revolutionaries and British soldiers alike are buried here in the fourth-ever cemetery in Boston.

The site of Paul Revere's historic two lantern warning.

A celebration of capitalism in Midtown.

Visit the monolithic tomb of America's most famous general.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

A crumbling staircase in upper Manhattan is all that remains of one of the most important sites in sports history.

"A hideous albatross in the Hudson River Valley."