You could spend hours here, so I highly recommend ...

You could spend hours here, so I highly recommend getting in early. I arrived just before 9AM, when the gates opened, and there was already a small line forming. To avoid the crowds I immediately went straight to the building housing the crown jewels. I got to see everything up close without issue, then I was one of the first people into the White Tower where the armor and weapons are on display. Tons of history to absorb here, it's definitely something you must see if you are on vacation in London. Very helpful and friendly staff, and the gift shops had a good selection of items.