BFI Southbank This must be one of the best film venues in the world, not just in London. I love it for its programming as well as the theatres themselves. It always has film seasons, festivals, retrospectives and special events. It hosts Flare, London's best LGBT film festival. It has dozens of showings combined with Q&A sessions with the film makers involved. It has a fantastic shop and library. It also has Mediatheque.