1,245+ pcs. Ages 8+. Assembled Size: 24 in. L x 16 in. W x2 in. H This award-winning puzzle recreates Saint Petersburgs world famous skyline, not only in three-dimension, using scale-model buildings, but also along the fourth dimension of time; spanning 300 years of architectural history. The puzzle includes 64 building replicas that depict Saint Petersburgs Skyline as it appeared as far back as 1703 through to 2008 with the completion of Business Center Benoit. The puzzle includes such iconic structures as the Peter and Paul Fortress, Summer Palace, and multiple Cathedrals and Churches that cover the Saint Petersburg city landscape. The base of the puzzle is a traditional 2D jigsaw puzzle that forms the city"s street layout. During the process of constructing the base map, one learns about Saint Petersburgs neighborhoods, streets, and more. Once the puzzle base is complete, the vertical building of Saint Petersburgs Skyline begins by placing 64 buildings and skyscrapers in chronological time sequence. This is done by following the enclosed 4D Time Poster, which also details the completion date of each building.