Belmont University offers pages of annotated, expandable thumbnail images of Christian structures and art ranging from the Catacombs of Ancient Rome to the 12th century.

An illustrated introduction to the development of the church plan in the 3rd and 4th centuries by Dr. Franklin Toker, University of Pittsburgh. Includes the house-church at Dura Europos (230).

Alan Petersen of Coconino Community College gives old St Peter's and St Sabina as examples of basilica plan churches and Santa Costanza as the model of central plan churches.

San Jose State University provides an extensive gallery of expandable images, accessed via pull-down menu and selection from an array. Basic information is given for each.

An account of its development from earliest beginnings to the Dark Ages with references and bibliography from the Associated Colleges of the South.

A book exploring the basilican church of Sant Agnese fuori le Mura, Rome, rebuilt 625-38 to replace a 4th-century church. Author's biography, reviews, images with extracts.