Structural Engineering
- 221
- Roman Bridges
- Photographs and text of various examples located in Rome, Narni, and other locations in Italy.
- 222
- The Tiber River, Tiber Bridges, and Tiber Island in Rome
- Descriptions and photographs of all the ancient Tiber bridges, listed in geographical, chronological, and alphabetical orders.
- 223
- Venice for Visitors: Bridge of Sighs
- Antonio Contino's bridge was built in 1600 to connect the Doge's prison with his palace. An illustrated article by Durant Imboden.
- 224
- Venice for Visitors: Rialto Bridge
- An illustrated article by Durant Imboden on this famous bridge with shops on it, built between 1588 and 1591.
- 225
- Wikipedia: Pons Fabricius
- Describes the construction of this bridge in Rome that survives from 62 BC.
- 227
- Ashtabula County Ohio Covered Bridge Festival
- An annual festival. Gives photographs and descriptions of each covered bridge in the county.
- 228
- Covered Bridges
- Inventory by Dale Travis of structures in the United States, Canada, and China. Includes maps and photographs.
- 229
- Covered Bridges of Indiana
- The County History Preservation Society list of all covered bridges in Indiana with descriptions, photographs and location maps.
- 230
- Maryland Covered Bridges
- History and photo gallery of all existing and past covered bridges in the state of Maryland.
- 231
- New Brunswick Covered Bridges
- Browse through photographs by region, or via an alphabetical list giving location, date of construction and comments. Also navigable location maps, news and discussion group.
- 232
- The Covered Bridges of New Brunswick
- Has photographs of all 66 covered bridges in the province, including two that burned in 2001.
- 233
- Wikipedia: Covered bridge
- A description, history and gallery of examples of this bridge type from the free encyclopedia.
- 234
- Wikipedia: Kapellbrücke
- The lakeside Swiss city of Lucerne is famous for its medieval wooden Chapel Bridge (largely restored). An illustrated article from the collaborative encyclopedia.
- 235
- Aqueducts of Rome Under Augustus
- Illustrated article by Al Schlaf. Includes the establishment of the centralized water office and the restoration of the older aqueducts and construction of the new.
- 236
- Chirk and Pontcysyllte Aqueducts
- Data and photographs of the structures constructed by Thomas Telford for the Llangollen Canal.
- 237
- Frontinus on The Aqueducts of Rome
- English translation of the complete text of the De Aquis (de Aquaeductu Urbis Romae), linked to the Latin and to a photostatic reproduction of the entire surviving medieval manuscript.