KRAKOW, POLAND - MAY 13: Visitors stand in line at Clock Hall during the 13th Museum Night at Krakow, Poland on the May 13,2016. During the Night Museum almost 50 museums will be open for free from 19:00 to 01:00.Along with their permanent exhibitions, many will have special features, tours, workshops, film screenings, lectures and concerts. Omar Marques / Anadolu Agency