PBS
Pbs Nova: Secrets of Lost Empires
NOVA ferrets out long-forgotten secrets of architects and engineers of the early civilizations. Content focuses on the trebuchets of medieval Europe, the pharaoh's obelisks of ancient Egypt, the moai statues of Easter Island, the...
Wikimedia
Wikipedia: Trier
Wikipedia, a publically-maintained wiki, offers information on the German city of Trier, including its well-preserved Roman buildings, city gate, and baths. There are images and external links, as well.