I recently spent a few days in Rome, the Eternal city. One day I went to Castel Sant’Angelo which had a tumultuous but fascinating history which you can read about here:
https://en.wikipedia.org/wiki/Castel_Sant%27Angelo.
The place is well worth visiting and although the museum claims to have 6000 items of arms, disappointingly only a couple of dozen are displayed.
pic 3: reconstruction of 16thC gunsmith workshop in Bastion of San Giovanni
pic 4: reconstruction of 16thC guardroom. There is a trap door for enemies who had made it inside with two gun openings in a door opposite.
pic 9: breast plate for Knight of Malta
pic 10: landsknecht sword