The events of Open–City Open House London are held, once a year, in mid September. The public can visit about seven hundred unique public buildings that are usually closed to visitors.
This is an urban fiesta of buildings, places with unique decoration and various neighborhoods in London.
The program, list of the places and houses, schedule of events, how to get, FAQ etc. is present in the event’s link website. See details below, under “Event Related Information” section.