Heritage Open Day: Visit one of Rochester's ancient parish churches, climb the tower and take in the spectacular view of the Medway Towns. St Margaret's Church dates back at least to the 13th century. The nave and chancel were rebuilt in the early 19th century in the classical style, but the 15th-century bell tower was retained. The tower commands spectacular views across Rochester and over the Medway Valley to the North Downs and to the neighbouring towns of Chatham and Gillingham. Among the church's treasures is an unusual brass memorial to a 15th-century vicar - unusual because it is engraved on both sides and shows him wearing slightly different vestments, apparently correcting an earlier mistake. The church's many memorials include a number reflecting the area's naval connections. Also commemorated is John Newton, a reformed slave trader and composer of hymns, including 'Amazing Grace'. Newton was married here in 1749.