on the outskirts of welwyn are the remains of a 3rd-century roman bath-house, which was once part of the dicket mead villa. local archaeologist tony rook discovered the villa and bath-house in the 1960s and excavated them with a team of archaeologists and volunteers from welwyn archaeological society. the remains of the bath-house are now preserved in a vault under the a1 motorway. the site is now run by welwyn hatfield museum service and is sometimes opened to the public.