Somerset House contains a formidable art gallery (the wonderful Courtauld), a beautiful fountain court, a terraced café and a classy restaurant. Read more.
Indescribable, you just have to go there. Especially amazing if you can go for the once-a-month candle-lit viewing. One of the most interesting things I've seen in London. Read more.
On Fridays the Royal Academy stays open until 10pm (last admission 9.30pm). Read more.
Launched in Battersea a few years ago and asked creative types to come and draw inspiration -- quite literally. With every whitewashed surface acting as a personal notepad. Read more.