4D Cityscape Berlin Puzzle. Rebuild Berlin"s historic skyline in 3D using scale-model buildings, while adding a fourth dimension... time. Not only is this puzzle in three dimensions, it uses scale-model buildings, and also includes the fourth dimension of time - spanning over 700 years of architectural history. This puzzle includes 138 building replicas that depict Berlin"s skyline as it appeared as far back as 1292 through 2006 with the completion of Hauptbahnhof. During the process of constructing the base map, one learns about Berlin"s neighborhoods, streets, museums and more. Once the puzzle base is complete, the vertical building of Berlin"s skyline begins by placing 138 buildings and structures in chronological time sequence. Features: Includes such iconic structures as the Marienkirche, Friedrichstrasse, Checkpoint Charlie and Kollhoff Tower In 1961 replicate history as you build the Berlin Wall using 60 replica pieces In 1989 remove the wall as you re-join East and West Berlin together Puzzle base is a traditional 2D jigsaw puzzle that forms the city"s street layout and geography 138 vertical buildings and structures turn the puzzle 3D Learn about Berlin"s neighborhoods, streets, museums and more Includes 4D time poster to follow Dimensions: 24" L x 16" W x 3" H Weight: 1.5 lbs.