The British Museum is absolutely huge so if you are in london I remend taking the british museums walking tour. I can't remember the exact details but it leaves from holburn station and isn't too expensive.
The Museum's main entrance, the building stretches out from here on both sides.
The highlight of the trip for me was seeing the Rosetta Stone, which enabled scientists to decypher hieroglyfics for the first time. Amazing to see something like this in a country so far away from where it was found.