Naturally formed white marble arch housed in an abandoned marble quarry from the 1800s.

The railroad tunnel nicknamed the "Bloody Pit" for taking the lives of hundreds during its construction.

This giant Massachusetts sycamore is said to hold the dubious distinction of being the "widest tree East of the Mississippi!"

Mass Grave of 48 colonists killed in a raid by Native Americans and the French in 1704.

A mysterious collection of stones stand outside a small New England town.