The ultimate jigsaw puzzle and the first to use time as the fourth dimension! ; ; First assemble the base jigsaw. Then add the interlocking second level. Then with the aid of the poster start to add the iconic buildings in the order in which they were built starting at 1812 and building the city up to the year 2013. You can see the changing skyline over this time! ; ; The jigsaw pieces are made from high quality foam board so that they lock firmly together and the scale models of the buildings are high quality injection mouldings and slot securely into the foam board. Includes the famous 'twin towers' and the new World Trade Centre whose construction has just started. ; ; Features glow-in-the-dark streets for added impact!