National Museum Science and Technology Leonardo da Vinci
Huge and filled with experiments on subjects from energy to communication, this is 50,000 m2 of investigation into science and technology, with 16,000 historical objects and 13 interactive laboratories. Plus it has models of some of Leonardo's famous inventions, including war machines, flying machines, and more.
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The good part, tiqets! Saved an hour queueing.
The bad part, it was full of families with ill-mannered children and more than them their parents! Seemed to be a kindergarten more than a cultural place.