White Tower in London Borough of Tower Hamlets

You're standing by the White Tower, the great stone keep that still towers over the rest of the Tower of London. Have a look at the corners. On the west side there are square turrets, and to the north-east a round tower with a spiral staircase inside. Then, in the south-east corner, there's a big rounded bulge. That's where the chapel sits, and you'll hardly find a projection like it on any other castle.