I'm in Manitowoc, WI visiting with family and fishing across the river from the USS Cobia yesterday. I'm too old and fat to try squeezing into the realm of the submariners. But it's interesting to look at.
This WW2 submarine, the USS Batfish, is berthed just off the Arkansas River in Muskogee, Oklahoma and visitors are able to go inside the sub and also see other military equipment on display there.