Les monuments et les site historiques

1. Interactive Map of Monuments and Museums
2. The Official Paris web site for tourism
3. Monuments in Paris (a commercial site)
4. More on Monuments - by categories
5. ParisDigest Monument Page
6. Paris Digest Monument Google Map
7. Popular Places in Paris
8. A View on Cities (Paris) -- includes bridges, parks, squares)
9. WebMuseum (Paris)
10. ASAP France
11. Landmarks and Monuments in Paris
12. Pariswater.com (bridges)
13. Paris Pictures (organized by churches, museums, etc.)
14. Paris Bridges (close ups of each bridge)
15. Stravinsky Fountain

To find photos, look for photos in the public domain or with a creative commons license that allows you to re-use the photo.

http://flickr.com (try searching for "creative commons your topic"

Wikimedia Commons -- search for your topic. Includes images with commons licensing, public domain, and historical photos.