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National Register Database
The United States National Register of Historic Places maintains this online index with descriptive information about America's historic properties. You can search by name, architect, significant person, multiple property submission name, location, Federal agency, or any of a number of themes used to organize Web pages. There are more 10,000 links.

Online Archive of California
Browse or search extensive collections of digital resources, including tens of thousands of photographs, paintings, graphical materials and other types of images.

RIBA Library Catalog
From the Royal Institute of British Architects, a free text-only index to 150,000 articles from 300 journals in 20 languages, and 50,000 books, drawings, and photographs. Photographs can be ordered for a fee.

archINFORM
This massive database has facts and images for more than 12,000 completed and unrealized projects from around the world. The emphasis is on twentieth century architecture.