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/

International Peace Highway Project
- International Highway Construction Corporation, supporters of a highway system connecting most of the world which would include a Bering Strait bridge and Japan-South Korea tunnel.
- http://www.iijnet.or.jp/IHCC/index.html

The Bridges Project
- Online database of significant bridges compiled by the Department of Civil Engineering at Rice University. Includes photographs.
- http://bridges.civil.rice.edu/

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/

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