📜 Historic granite coastal fortification, built between 1844 and 1869, located on the Penobscot River. 🔍 Designated a National Historic Landmark in 1970 and America's first fort named after Major General Henry Knox. # Why Go 🏛️ Explore impressive military architecture and history in this well-preserved 19th-century granite fort. 🔭 Enjoy 360-degree views from the Penobscot Narrows Bridge and Observatory. 🚶 Easy access to nearly all areas of the fort. 👪 Family-friendly with a museum and gift shop, suitable for history enthusiasts. # Why Avoid 🚫 Site and Observatory closed November 1 to April 30. # Tips 💡 Check the official website for event schedules like Civil War Days. # Cost 💰 Entrance fees vary by age and residency, Observatory ticket extra. Fort & Park: Maine Resident Adults $4.50, Nonresident Adults $6.50. With Observatory: Maine Resident Adults $7.50, Nonresident Adults $9.50. # Hours 🕒 May 1-Oct 31: Daily, 9 am to 5/6 pm (Fort open longer). Nov 1-Apr 30: Fort/Observatory closed, park grounds open 9 am to sunset. # 🅿️ Parking On-site parking available at 740 Fort Knox Road, Prospect, Maine.