"The Digital Bridges Web site consists of a collection of thirty representative 19th century American bridge engineering monographs, manuals, and documents from the Lehigh University Libraries' Special Collections." The archive provides an interesting retrospective into the beginnings of major bridge projects; the material is complete with high-resolution photographs and text scanned from original...

Great Structures of the World is unlike similarly themed Web sites in that it does not focus on a single type of structure. Skyscrapers, bridges, tunnels, and even more exotic human creations are included in this information and picture archive. Users can browse through structures in Asia, Canada, Europe, the U.S., and elsewhere. Features include the world's largest indoor ski area, the world's...