Tilbury Fort is one of England's most impressive examples of 17th-century military engineering, standing sentinel on the banks of the River Thames to defend London's river approaches against enemy invasion. Built on a site first fortified by Henry VIII, the fort was dramatically expanded under Charles II following the humiliating 1667 Dutch raid that exposed London's vulnerability, resulting in the magnificent bastioned fortress still visible today. The fort's complete circuit of moats, impressive array of outworks, and sophisticated military design showcase the pinnacle of 17th-century fortification technology. Through its long history, Tilbury Fort served as a prisoner-holding facility after the 1745 Jacobite Rising and participated in World War I air defence, successfully shooting down a raiding Zeppelin in 1916. Now managed by English Heritage, the fort remains one of the finest surviving examples of a 17th-century artillery bastion anywhere in England.