Test your skills of observation with this clever puzzle book! Forty architectural masterpieces— including the Dome of the Rock, the Taj Mahal, Hagia Sophia, the Ponte Vecchio, and the Forbidden City—are reproduced in duplicate on each spread. But what appear to be two identical images actually have subtle differences…and it's up to you to spot them! A figurine missing from a temple, a color change on a dome, a missing radio antenna… Some pages are easier than others and some are downright challenging, but the answers are in the back of the book for when you're feeling really flummoxed. Fun!