I have not visited inside the palace but remember being driven by a friend who lives in Warsaw to the gardens at night. It was all very beautiful and illuminated but it was also very cold walking around outside. We went inside somewhere as I remember having to pay some entrance fee, I even had to lie about my age so as to qualify for the reduction! I can not remember for the life of me what was inside but the whole experience was well worth the visit. I also remember on the way there from Wasaw, we passed an amazing huge church or cathedral en route to Wilanow it was pitch dark so saw very little of it but could make out even at night the huge scale of this building.