On Fridays the Royal Academy stays open until 10pm (last admission 9.30pm). Read more.
The British Library's exhibition spaces are open late weekly on Tuesdays, from 9.30am-8pm. On show are temporary displays as well as permanent exhibits in the John Ritblat Gallery. Read more.
Selected galleries of the British Museum are open until 8.30pm every Friday evening, augmented by tours, special events and food and drink. Read more.
Somerset House features a formidable art gallery, a beautiful fountain court, a terraced café and a classy restaurant. The courtyard and fountains are open until 11pm in in summer. Read more.
Design Overtime takes place irregularly every few months, when the museum opens from 6pm to 10pm for talks and workshops based on the current exhibitions Read more.