Go Beneath the Erie Canal with This Road Tunnel
The Culvert Road tunnel in Medina, NY, is the only place where you can cross UNDERNEATH the Erie Canal. Not that you could get us to try it...that sounds creepy. The man-made Erie Canal was created to provide easier access between the Atlantic and the Great Lakes Region. Many bridges cross the canal; however, there is only one roadway that goes beneath the canal. The tunnel was built in the 1820s.
At 7 feet, 6 inches clearance, it's not particularly huge, but it's pretty cool none the less.