 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.