Just across the Piscataqua River and Prescott Park sits the eerie abandoned Portsmouth Naval Prison in Portsmouth, New Hampshire. The facility is considered the Alcatraz of the East.
It was built by a French immigrant for his English bride back in the 1800s, but now it's just ruins in the Illinois woods. See what remains of Hartford Castle originally known as Lakeview.
There is a former riverboat casino that is abandoned and still floating on the Illinois/Iowa border nearly adrift in the Mississippi River near Burlington.
This is what remains of Trinity Lutheran Hospital in Kansas City, Missouri. Urban explorers found an intact morgue and what appears to be millions of dollars of abandoned equipment.