The Bridges Project
Online database of significant bridges compiled by the Department of Civil Engineering at Rice University. Includes photographs. http://128.42.22.5/
The West Point Bridge Design Contest
Annual competition sponsored by the American Society of Civil Engineers. Includes free software download. http://bridgecontest.usma.edu/
MrTunnel.com
Discusses many projects. http://www.mrtunnel.com/
The Tunnel Page
The longest road and rail tunnels in the world, grouped by categories such as sub-sea tunnels and immersed tubes. http://home.no.net/lotsberg/
Bridge of the Month Quiz
An image is posted inviting entrants to identify the feature. A free copy of a book on the subject is awarded to one correct entrant per month. http://www.bridgeink.com/