bridges and tunnels

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• - The longest road and rail tunnels in the world, grouped by categories such as sub-sea tunnels and immersed tubes.
  
• - Online database of significant bridges compiled by the Department of Civil Engineering at Rice University. Includes photographs.
  
• - 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 collection of photographs of facilities and a large worldwide inventory of suspension bridges.
  
• - Discusses many projects.