Walden Castle was a Norman earthwork motte and bailey fortress, founded by Geoffrey de Mandeville family. In 1347, Humphrey de Bohun founded the stone castle, when he was granted a licence to crenellate. Sadly all the earthworks have been levelled but the lower storeys of a large interesting square keep and forebuilding have survived but only because they were originally enclosed within a motte. Inside its flint rubble walls are traces of a spiral stair, central pier base and well-shaft. Rubble foundations have also been found in the large bailey, with the surrounding streets giving its layout. 9 miles south-west is Mountfitchet Castle.