US-based Castles Unlimited offers a commercial research service. Lists of castles; photo gallery; ground plans and bird's-eye views of a few castles; general background articles; glossary. - (Read more)

Uses interactive maps to find castles in Great Britain, featuring descriptions, photos and directions. - (Read more)

An interactive map leads to short descriptions by Risto Hurmalainen of castles and historic buildings he has visited, a gallery of expandable thumbnail photographs and links to official sites. - (Read more)

A guide with many photographs, to some of the castles, and stately homes of Britain, with particular emphasis on Nottinghamshire, where the author comes from. - (Read more)

Site provides information and pictures for many castles in England, Scotland and Wales. Visitor information is enhanced by use of ordnance survey maps to pinpoint actual locations. Castles are easily searchable by location or alphabetical listings. - (Read more)