SOAS university has a small gallery space dedicated to exhibitions about Asia, Africa and the Middle East. There's a small but beautiful Japanese zen garden on the rooftop (currently closed for refurbishment)
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?!
I grew up around this area - it really is a gem of a place. The interior is so cool, with sort of organised clutter everywhere. They have a little garden and they serve food. Its not the best in the world, but the whole experience there is great.
Aside from the fact of the underground being the oldest running railway system in the world, I find the underground just an incredibly strange place. Sometimes it’s like I’ve entered an organised maze and just walk without even thinking. The photo is taken of the floor from one of the trains, it’s normally what you tend you look at when you’re on the train.