Rayleigh Castle is a historic fortification located in Rayleigh, Essex, England. Built in the 13th century, it was constructed under the orders of Henry III to defend against potential invasions. The castle features a motte-and-bailey design, with a large earth mound and a surrounding ditch. Today, the ruins of Rayleigh Castle are a popular attraction for visitors. The site offers scenic views of the surrounding area and serves as a reminder of the region's medieval history. The castle is also a designated Scheduled Ancient Monument, highlighting its cultural and historical significance.