Enjoy putting together this Ravensburger Doors of the World puzzle. It is presented in full color and features 24 images of doors from buildings around the world. The subject is presented in a grid format for an overall crystallographic collage aesthetic. This 1,000-piece puzzle is constructed from an extra durable cardboard material, and it has a glare-free, linen paper surface. Each piece is carefully cut to produce an ideal interlocking fit. It also has several puzzle piece shapes for a challenging yet enjoyable experience. This cardboard puzzle is recommended for individuals ages 12 years old and up.