- Bridge and Tunnel Centers
- Provides an index of the pages included in the publication presented by the University of Michigan.
- Brunel Museum - Thames Tunnel
- Shows pictures of the structure including historical information on its construction.
- Catskill Archive - Hoosac Tunnel
- Indicates the construction details of the edifice as well as historical records and gallery of pictures and illustrations.
- Chicago Tunnel Company Railroad
- Description of the electric rail way capable of locomotive operations and freight cars. Includes related references.
- Commissioner's Report - Sutro Tunnel
- Indexes the contents of the book that provides details on loan recommendation for the construction and other works.
- FranklinSites.com - Hoosac
- Relevant information about structures as well as adventures presented providing insights to the tourism in the region.
- Hezekiah's Tunnel
- Statistical overview about the structure's construction with illustration on its route coverage and other project details.
- Hoosac Tunnel Historical Notes
- Compilation of related reference materials about the construction and project documentation of the structure.
- Incidents Illustrations - Tunnel Construction
- Showcases a gallery of images depicting the possible accidents that can happen during the building of the underground structure.
- Letter from the Secretary of War - Sutro Tunnel
- Published reference on the commission's report on examination activity conducted in the structure.
- Mike's Railway History
- Reference for the construction of tunnels from previous years up until the year 1935. Features historical pictures and illustrations.
- Modern History Sourcebook - Francis Fox
- Exposition on the procedures and related information about the Swiss' construction of well-known tunnel during the year 1905.
- Mount Cenis Railway and Tunnel
- Narrative on the project initiative as well as discussion of relevant matters and illustration of the route.
- Nevada History - The Sutro Tunnel
- Exposition article detailing the politics and other issues behind the construction of the underground structure.
- Severn Railway Tunnel
- Description on the building of the structure as well as other details on the project. Also provides an illustration on its covered areas.
- St. Clair Tunnel Company
- Historical reference for the commercial firm's operations including details on its engineering projects.
- Standedge Tunnel
- British underground structure believed to be the highest, deepest and longest. Includes details on restoration activities.
- Superintendent's Report - Sutro Tunnel Company
- Content index of the publication that documents the construction operations of the commercial firm from a direct supervisor's records.
- Sutro Tunnel Company Collection
- Archive of documentations about the construction of the structure including record of financial operations, photographs and other materials.
- Tunnel of Eupalinos
- Narrative of the history of the tunnel's construction during the ancient times.
- Tunnel of Samos
- Points out the construction of the structure in the Greek island including details on its usage during ancient times.
- Tunnel Under the East River
- Report on the construction and project initiation presented by the company that operated it. Features facsimile of the original documents.
- Tunneling Under The Hudson River
- Copy of the published book authored by S.D.V. Burr covering topics on the achievement of constructing the structure.
- Tunnels - History and Heritage
- Outline of significant developments in constructing underground railways starting from 500 B.C. up to present times.
- Union Canal Tunnel
- Discusses the operations of the structure known as one of the oldest underground ways in United States.
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