Robin Hood Gardens is a residential estate in Poplar, London designed in the late 1960s by architects Alison and Peter Smithson and completed in 1972. It was built as a council housing estate with homes spread across 'streets in the sky': social housing characterised by broad aerial walkways in long concrete blocks, much like the Park Hill estate in Sheffield; it was informed by, and a reaction against, Le Corbusier's Unité d'Habitation.