Mentioned by London City Calling
50 free things to do in London
"Located on the 43rd floor of the Walkie Talkie building in the City of London, the Sky Garden is the capital’s highest public garden and one of the coolest places to visit in London for free. The garden’s large plant-filled atrium has floor-to-ceiling windows with amazing panoramic views out over the city below and is open throughout the day and into the evenings on weekends – making it one the best free things to do in London at night too!. There’s also an open-air covered terrace on one side."