National Science Museum, London

Nearest tube station is South Kensington on the Circle, District and Picadilly lines.  There is a pedestrian walk way to the main entrance, or you can use Gloucester Road station and walk for about 10 minutes.

The science museum is fantastic.  There are of course many permanent exhibits, and also there are many new ones each visit.  It is really impossible to see everything in one visit, and of course each time you go there will be something new to see, so its a great place to go often.   It's a good idea to check out their website before you plan your trip so you can decide what particular exhibits might interest you.

I couldn't possibly post all photos so here's a small sample of what you can see there.   The Natural History Museum is just next door and the V & A is across the road, so you could spend  little time in each, every time you go.