Bridges and Tunnels

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.hevanet.com/bridgink/

Bridgepix.com
Contains photographs and scans of other media of subjects worldwide.
http://www.bridgepix.com/

MrTunnel.com
Discusses many projects.
http://www.mrtunnel.com/

A Span For All Seasons
A collection of photographs of facilities and a large worldwide inventory of suspension bridges.
http://www.bridgemeister.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/