Canterbury's underground Roman Museum is built around the remains of a Roman town house with mosaics preserved where excavated.MuseumGroup Visits St Martin's Church North Holmes Road, Canterbury, Kent, CT1 1PW, Tel: 01227 768072, www.martinpaul.org(0 miles, 1 km)St Martin's Church is the oldest in England still in use as a parish church and is part of the Canterbury World Heritage Site.