Have you seen the new sign in town? Castine is part of the National Historic Register and has been since 1973.  According to the National Park Service:  " The National Register of Historic Places is the official list of the Nation's historic places worthy of preservation. Authorized by the National Historic Preservation Act of 1966, the National Park Service's National Register of Historic Places is part of a national program to coordinate and support public and private efforts to identify, evaluate, and protect America's historic and archeological resources." Thanks for the sign!!