The high altar at St Paul's Cathedral, an Anglican cathedral that sits on Ludgate Hill at the highest point of the City of London. The seat of the Bishop of London and the mother church of the Diocese of London, the present church dates from the late 17th century and was designed in the English Baroque style by Sir Christopher Wren. It was the tallest building in London from 1710 to 1967 and remains the second-largest church building in area in the United Kingdom, after Liverpool Cathedral.Photograph: David Iliff