City Walks Architecture Paris by Michael Herrman, boxed set of cards published by Chronicle Books. ISBN 978-0-8118-6862-4, price 18.95 US dollars from www.chroniclebooks.com
There are many interesting architectural buildings in Paris. This useful set of cards provides easy to follow directions for walks in Paris. In all there are 25 walking tours, the tours are arranged by theme. Each card has a map and directions as well as information on the buildings. Just take the card you need for that tour. My only gripe is that there is no guide as to how long the tour might reasonably take and no guide to how far you are walking.