Compare and contrast early Christian architecture

Christian Traditions http://list25.com/25-incredible-examples-early-christian-architecture/1/ Look through the 25 examples of early Christian architecture on this website. Then select five examples to compare and contrast. Briefly describe the examples you have chosen and then explain how the architectural features connect to important Christian symbolism such as the cross. What is the significance of other features such as domes, towers, and pinnacles? If you need additional information on Christian basilica and church architecture, please see: https://en.wikipedia.org/wiki/Basilica