London is so vast I end up spending hours travelling on trains. They are by far the best way to travel around on and are always full of weird and wonderful characters.
This beautiful 19thC industrial building is situated in Markfield Park just around the corner from my studio. Once a sewage treatment works serving the whole of Tottenham and now a museum. The fully restored Victorian pump engine is only open to the public on the second Sunday of every month but the outside of the building and surrounding park is a worth a visit regardless.
Eccentric and surprising house and museum of architect Sir John Soane. Mostly unchanged since his death over 180 years ago, it is full of atmosphere. Also have spotlit, late night openings.
On a hot day there is nothing better to do in London then go for a swim in the Heath ponds. You get completely transported you out of the city as Hampstead feels like being in the countryside except you're in central London?!