I also need to catch up with my meme -
4 What's the best museum you've ever been to?
I truly love The British Museum and the V&A in London ... but even better is The Wallace Collection, also in London.
The Wallace Collection is a combination of rooms set as they were in the early 19th century, plus artwork (including some Canalleto's, which I love), and then museum cases .... of which they have the oldest complete horse armour. So, for me, a great combination for everyone (and it's free). I have been at least 4 times, and there is always something different to spot ... and they have a great coffee shop!