Rundetaarn

With a little extra time in Copenhagen we took the good advice of a local who said the 1642 Round Tower was a child-friendly place.  Spot on!  It turns out history can be interesting if you get to choose what to read and ignore the other bits.  Unusual displays included a bomb from the 1807 British attack and a book it damaged, the privy next to the library (maybe used by H.C. Andersen?), and a wonderful view from the top next to the observatory influenced by Tycho Brahe.

You may be able to see the bridge to Sweden in the background.