The oldest building in the city is St Mary's Tower, which dates from the late 15th century.</ref> This forms part of the City Churches, which consist of St Clement's Church, dating to 1787–8 and built by Samuel Bell, Old St Paul's and St David's Church, built in 1841–42 by William Burn, and St Mary's Church, rebuilt in 1843–44, also by Burn, following a fire.</ref> Other significant churches in the city include the Gothic Revival Episcopal Cathedral of St Paul's, built by Sir George Gilbert Scott in 1853 on the former site of Dundee Castle in the High Street,</ref> and the Catholic St. Andrew's Cathedral, built in 1835 by George Mathewson in Nethergate.</ref>