Share Tweet Pin Email By Katherine Tinsley 1:38pm PDT, Oct 30, 2025 _ King Charles III's Windsor Castle is considered the "most haunted" royal estate.Keep reading for the details...MORE: Follow Wonderwall on MSN for more top news _ Queen Elizabeth II admitted to seeing supernatural things at Windsor Castle, where there have reportedly been over 25 different ghostly sightings, per Daily Express.Windsor was first built in 1070, and almost every monarch since King Henry I has used the property.