If you’re interested in anything military related, you’re a true history buff or you just like museums for free this is one of the best ones you can visit. Renovated only couple of years ago it gives a great insight into the military history of our country covering the period from the dark ages till present day. Personally, I would highlight fully immersive exposition of WWI when you get to fell how soldiers felt in trenches in France.
Give it a go – you won’t regret!