- MrTunnel.com - http://www.mrtunnel.com/
Discusses many projects.
- The Tunnel Page - http://home.no.net/lotsberg/
The longest road and rail tunnels in the world, grouped by categories such as sub-sea tunnels and immersed tubes.
- Bridge of the Month Quiz - http://www.bridgeink.com/
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.
- A Span For All Seasons - http://www.bridgemeister.com/
A collection of photographs of facilities and a large worldwide inventory of suspension bridges.
- The Bridges Project - http://bridges.civil.rice.edu/
Online database of significant bridges compiled by the Department of Civil Engineering at Rice University. Includes photographs.
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