Boston USA Time Puzzle 1100 piece Discover the world! The 4D Cityscape Boston Time Puzzle is an award-winning puzzle that allows you to build a world famous city and learn history The first layer is how the city used to be, the second is the modern day jigsaw map and the last layer utilizes the 4D Time Poster to place each building according to time Great for education  learn how a city develops and evolves, historic architectural styles and geography Makes a great souvenir and gift for the Boston lover or just a fan of history Measures: 24" L x 16 W x 3" H. Over 1100-piece puzzle. For ages 14 and up