London has a unique series of churches built after the Great Fire of 1666, when most of the City of London was destroyed. Among these iconic churches are St Paul's, St Mary-le-Bow, St Bride's, St Clement Danes, St Martin-in-the-Fields, St Mary-le-Strand, St George Bloomsbury and Christ Church Spitalfields. They remain today as outstanding landmarks that define their local cityscapes. Designed by Sir Christopher Wren and his followers - Hawksmoor, Gibbs, Archer and James - these beautiful churches embody spiritual principles expressed through the conventions of Classical architecture. Underlying their outward, visible forms is sacred geometry, an ancient art that explores the invisible inner structure of the Cosmos and gives expression to it in physical form. In this book, Nigel Pennick explains the sacred geometry, spiritual symbols and emblems that make these churches among the most notable buildings of London.