Manzanares el Real
The XV century castle, known as the Castle of los Mendoza, stands next to the Santillana reservoir, which has supplied water to Madrid and aquatic scenery to Hollywood over the years. Construction began in 1475, and today the castle houses a museum and a collection of tapestries.
The castle is of course haunted, by a shepherdess called Maricantina. A local noble, the Marques de Santillana fell in love with her, but as often happens, she was considered unsuitable by the family and died of grief.
Some say she was a witch, probably his family.
Today she wanders through the castle singing sad love songs.