It has often been said, ‘To see London, look up!’ At street level what ones sees is often just the mundane, but above can be seen a galaxy of fascinating features. This guide introduces the readers to the architecture of London through four bus journeys: two through the City of London and two through the City of Westminster. It describes what is progressively seen, including churches, pubs theatres, and sculptures. The reader is introduced to architectural terms used in describing buildings with a glossary and the derivation of street names. Much more is also included within these pages. The book is also peppered with interesting anecdotes that the author has collected from many sources and over many years. While primarily focused on what can be seen from the top of the buses, this book will be of interest to those walking the routes on foot and to all who have an interest in London, its history and its architecture.