Sometimes I run across sites that, at first glance, seem uninspiring and not well organized. This is one of those, HOWEVER, once you start clicking around, you will find some wonderful full-color photographs of buildings that will make up for the lack in design. Lots of great information and research as the writer expounds on different archectural features and examples.
Click the link at the top and you can search for different types of buildings. My main two favorites are:
Other designs worth peeking at - bridges, temples, churches, and even tombs.