The main Cenotaph memorial is in Whitehall, London. All over the UK and the world there are many more however. The tomb of the unknown soldier is usually thrust into the sky at the top of the memorial. This tomb is empty and thus has contained the perceived graves of all other wars that have come after. The designs are mostly the same but every now and again you get one like in Liverpool, where the tomb is almost sideways.
Auckland, New Zealand
Coronation Park, Winnipeg