This Web site contains information on hundreds of the world's longest tunnels. There are four main categories that list facts about road, subsea, railway, and canal tunnels. Each of these sections can be browsed in its entirety or separated into individual countries. The data is presented in tables and includes years of construction, length, depth, and gradient. Future projects are also shown, and many of the tunnels have links to sites with further information. A problem with the site is that not all the tables are sorted the same way. Some are sorted by length, others by opening date. Despite this flaw, the Longest Tunnel Page is an excellent resource.
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