Fort Knox and Penobscot Narrows Observatory
See main listingFort Knox sits just off Route 1 between Camden and Bar Harbor, about an hour west of Acadia. The 19th-century granite fort is well preserved, and the real draw for most visitors is the adjacent Penobscot Narrows Observatory, a 420-foot observation tower that offers sweeping views of the Penobscot River and surrounding landscape.
You can buy a ticket for the fort alone (around $6.50 for out-of-state visitors) or combine it with the tower. Dogs are welcome on the grounds, and staff members are consistently friendly. The site works well as a convenient stop if you're driving between the coast and Bar Harbor. A recent visitor appreciated the tower's vantage point and called it a great experience.








