Fort Knox, Maine's largest historic fort, features stunning military architecture and master granite craftsmanship. Constructed between 1844 and 1864 by master craftsmen and never fully completed, this is an unaltered example of a large mid-19th century granite coastal fortification. It is also New England's finest unmodified specimen of military architecture of the period.

The fort was strategically located on the narrows of the Penobscot River to protect the river valley from naval attack. Although it never saw combat, Fort Knox was garrisoned during the Civil and Spanish American Wars.

Fort Knox bears the distinction of being Maine's first granite fort. About 500 troops from Connecticut were stationed here during the Spanish-American War. They lived outside the main fort structure in large tents. Today, visitors can stroll the grounds of this great fort and learn about the rich history of the troops who served to protect American interests during the 1800s.