Lots happening in and around London on 21-22 September with Open House London 2019 on 21-22 September and Car Free Day on Sunday 22 September and you can visit them by bike.
With Open House London it is possible to visit hundreds of buildings of architectural interest and historical, cultural and general interest in central London and the Boroughs. With the Car Free Day on Sunday, 22 September road closures or bus-only zones will be enforced between 10.30am and 5pm with twenty kilometres of roads closed in central London and cycling and walking encouraged around Tower Bridge, London Bridge and the City of London.
You can learn more at:
Buildings open include for example the Treasury Office, Foreign Office, Whitehall, various embassies, Saville Row, etc. Some building visits require email booking in advance (eg Wrotham Park, Barnet) and others are by ballot only with those ballots mostly closed now (eg No. 10 Downing St and new US Embassy).
But don’t be discouraged, hundreds of other buildings are still accessible and open in your area and in London and don’t forget the Car Free Day on Sunday 22 September and maybe use your bike to get to some of these famous buildings?