3 links
Italian Renaissance Architecture
rubens.anu.edu.au
A collection of images from Art Serve at the Australian National University.
Renaissance and Mannerist Architecture
cupola.com
Howard Partridge provides a gallery of his photographs of 15th- and 16th-century buildings in France, Denmark and Italy, including works of Palladio. Part of the Cupola Collection.
Wikipedia: Renaissance Architecture
en.wikipedia.org
An illustrated description of the archirecture of the Renaissance.