Various London locations

London is a famously green city – nearly half of its many square miles is parks, heaths and other open space. A lot of that open space, though, consists of private squares and gardens, most of which we never get to see, never mind hang out in. London Square Open Gardens Weekend is here to address that, prising the keys out of the capital’s secretive gatekeepers to fling open more than a hundred secret green spaces. The event exclusively reveals some of the city’s least-seen spaces: historical, traditional, contemporary and experimental, across all four corners (and the middle bit) of London. They include formal gated garden squares, rooftop terraces with commanding views of the city skyline, community allotments and wildlife havens. Weekend tickets are available, and guided tours, suggested walking routes and cycling tours taking in a selection of the gardens will also be on offer. There is a ballot entry system for some of the most popular gardens.