KJK Ravi Teja

It's a beautiful catholic church in the historic center of Warsaw. I visited during the closing hours so there weren't any people except an old lady. Check and visit when the organ is playing, it'd be much nicer.

We planned for National Museum of Warsaw but it was closed as it was a holiday, so visited this adjacent museum. The entrance was open and was for free of charge for outdoor objects. This museum is one of the largest collections of military objects in Poland, spanning from 10th century until WWII. The open area consists of many armoured vehicles, artillery pieces and aircraft, mostly from the WWII era, with English explanation boards. You might find it interesting if you're into airplanes, helicopters and stuff like that. Have fun!