ListingsUpdated Sat 24 Oct

Museum of the Order of St John London: what's on

A Tudor gatehouse in Clerkenwell holding the history of the Knights Hospitaller and, through them, of St John Ambulance. Free. The gatehouse and the Norman crypt across the road are shown by guided tour on set days, and the crypt is the part worth timing a visit for.

• Websitemuseumstjohn.org.uk