St Giles-without-Cripplegate is an Anglican church in the City of London, located on Fore Street within the modern Barbican complex. When built it stood without the city wall, near the Cripplegate. The church is dedicated to St Giles, patron saint of lepers, beggars and the handicapped.Wikipedia
Usually open to visitors between 11:00am and 3:00pm Mondays
Nearest stations: Barbican and Moorgate. You have to negotiate the maze of the Barbican development to get here, but it is signed.