Scapa Flow

Scapa Flow, originally uploaded by British Traveller.

The southern Orkney Islands enclose a dangerous stretch of water called Scapa Flow. It looks peaceful enough to me, but there's been countless shipwrecks here. It was also the scene of an astonishing piece of history in 1919, when in the biggest scuttling event in history, the Germans sank 83 of their own ships rather than let them fall into the hands of the British. You can still go diving to see the wrecks.