Museum of Polish Military Technology

This museum is basically an outdoor park surrounding an old fort that has been filled with a large variety of tanks, APCs, large guns, jets, and radar arrays. Just check out the location on Google maps to see how large the collection actually is. The tanks include a variety of T-34 variants moving up to present day vehicles including T-72 with upgrades. Some of the more rare items (in my opinion) is an M107 tracked artillery vehicle and the Soviet era radar systems. 

As far as aviation goes there is a large number of MIG fighter jets and a large bomber,