Big cities are packed with buildings and monuments that have become symbols known all over the world. Rome has the colosseum; paris has the eiffel tower, and all it takes is a glimpse of the statue of liberty to think of new york. But what did these and other cities look like before those iconic structures existed? And how were they designed and built? Use a three-color lens to see maps of the world’s major cities and the locations of their most famous buildings and monuments, then take a look at how these celebrated cities have changed over time and how their histories have been written.