MAKE IT HAPPEN
Open House London runs on the weekend of 16–17 September (openhouselondon.org.uk). Entry to the buildings is free, though some must be booked online and a few are by ballot. The printed guide listing all participating sights costs £7. Rooms at citizenM Tower of London are compact, welldesigned and often kooky; the best look to the White Tower, London’s oldest intact building (from £105; citizenm.com).