The site of the last opposed invasion of England in 1667 and the first land battle of the Royal Marines. The current fort was built in the 18th century, and modified in the 19th century with substantial additional 19th/20th-century outside batteries. Guided tours and audio tours of the fort are supplemented by a DVD presentation of the site's history, and by guided tours of the outside batteries. A new guidebook tells the fascinating history of the Fort.