24 lectures free on YouTube by Dr. Diana E. E. Kleiner of Yale University.
Description from YouTube chanel:
Via http://novitas-romanitas.tumblr.com/post/27700192300/free-roman-architecture-courseThis course is an introduction to the great buildings and engineering marvels of Rome and its empire, with an emphasis on urban planning and individual monuments and their decoration, including mural painting. While architectural developments in Rome, Pompeii, and Central Italy are highlighted, the course also provides a survey of sites and structures in what are now North Italy, Sicily, France, Spain, Germany, Greece, Turkey, Croatia, Jordan, Lebanon, Libya, and North Africa. The lectures are illustrated with over 1,500 images, many from Professor Kleiner's personal collection.