I've recently been to Warsaw and had a chance to stop by the Muzeum Wojska Polskiego (Polish Army Museum). There are quite a few items in display here, including World War Two planes and tanks. Inside you can also find an interesting exhibition about the Battle of Britain (with a focus on the Polish airmen contribution).
As I go trough the pictures, I will be uploading them at this location - It does take some time to go through them!
I hope you like it!