Overview of church history through the reformation: notes from classes taught at Community Bible Chapel, Richardson, Texas.
http://www.ritchies.net/churchhi.htm
History and description of the underground cemeteries used from the 2nd to the 5th centuries. Includes a section on the symbols used, but no images.
http://www.catacombe.roma.it/
Materials relating to the culture of the Mediterranean world in late antiquity (roughly 200-700 C.E.); by James O'Donnell at Georgetown University.
http://www.georgetown.edu/faculty/jod/wola.html
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