Despite the impressive number of events grasping for your attention across the capital this weekend, Open House once again proved a huge success, as the snaking queues and exasperated snoopers at some of the more popular attractions testified.
Contributors to the Londonist Flickrpool roamed widely across the boroughs, poking through the city's cubbyholes and poring into normally clandestine parlours, and exploring London's long history in the process, taking in everything from Roman architecture to the latest City skyscraper.
Main image: View from the 17th floor of the Broadgate Tower, by megapiksel.