This photo taken on Saturday, May 14, 2016 shows the outside of the POLIN Museum of the History of the Polish Jews in Warsaw, Poland, with the lights on for the visitors during the 13th annual Night of the Museums, an increasingly popular one-night event during which many museums and offices open to the public for free, offering special activities and exhibitions, in order to widen their public. (AP Photo/Czarek Sokolowski)