Pons
- Article from Smith's Dictionary of Greek and Roman Antiquities 1875. Illustrated with the original woodcuts.
- http://penelope.uchicago.edu/Thayer/E/Roman/Texts/secondary/SMIGRA*/Pons.html

Bridges of the World
- Photographs and histories from Glass, Steel and Stone of famous bridges historic and modern.
- http://glasssteelandstone.com/ByTypeBridges.html

Historic Bridge Foundation
- Advocates for the preservation of historic bridges. Includes Texas and New Mexico bridges.
- http://www.historicbridgefoundation.com/

Digital Bridges
- Online library of historical bridge design manuals and books from Lehigh University.
- http://bridges.lib.lehigh.edu/

A Span For All Seasons
- David Denenberg provides photographs of bridges and a large inventory of suspension bridges.
- http://www.bridgemeister.com

Living Bridges
- Illustrated review by Yoshitaka Mouri in Art Watch of the Royal Academy of Arts exhibition on inhabited bridges, including historical examples and past utopian bridge plans.
- http://www.dnp.co.jp/museum/nmp/nmp_b/watch/Oct29_e.html#3

Bridges
- Great Buildings Online provides images and information on a selection of famous bridges world-wide.
- http://www.greatbuildings.com/types/types/bridge.html