The szopka tradition originated in Kraków, Poland in the 19th century, when craftsmen began making nativity scenes depicting historical buildings from Kraków to earn extra income during Christmas. Szopkas developed from traditional nativity scenes and later Jasełka plays, and sometimes included movable puppets or figurines illustrating Polish culture. An annual szopka competition has been held in Kraków's Main Market Square since 1937, except during World War II, and the best entries are displayed in the Historical Museum of Kraków.