North Carolina's "Rocks" at the southern terminus of US-421 (and there is a sign saying that by the parking lot, also the other side says it is the beginning of US-421, kind of neat, i wish all roads would do that.)
U.S.-421 ends at a parking lot and from there you can launch a small boat and it is a popular fishing and crabbing spot.
This is referred to as the Swash Defense Dam and built back in the 1870s by the Army Corps of Engineers to close New Inlet, a very popular place for blockade-runners to run in and out of the Cape Fear River during the Civil War.
WLS Top Ten for July 22, 1968: "Born To be Wild"
15 hours ago