Heligoland fact and video of the day
In 1947 British forces set off here the largest non-nuclear explosion on record, blowing up what was left of Hitler’s island fortress.
That is from the new (and recommended) book Heligoland: Britain, Germany, and the Struggle for the North Sea, by Jan Ruger.
Here is further information, the blast was estimated to be one-third the power of Hiroshima, note that Heligoland is a holiday resort once again.