Iconic. Best for the Crown Jewels. Next, the compl...

Iconic. Best for the Crown Jewels. Next, the complex itself. Third, the Royal armour and various trophies taken in battle.
Challenging for those with mobility issues, but doable. Expect a bumpy ride in a wheelchair. You'll need someone strong to push you about. There is a lift for the White Tower but needs to be operated by staff.
Guards in grey with the big tall hats and automatic weapons do their thing and March about.