One of my favorite movie series', I used some of these films every year at Toledo. I used the movie "Stonehenge" to teach work and levers; I used "Medeivel Seige" to teach catapults and trebuchet's; and "This Old Pyramid" to teach inclined planes.
There are two series; the Secrets of Lost Empires includes: Medieval Siege, Easter Island, Pharoah's Obelisk, Roman Bath, and China Bridge.
The second set, Secrets of Lost Empires II includes: Pyramid, Stonehenge, Inca, Colosseum, Obelisk. Not all of them are available at PBS or NOVA websites, but they are easy to find at Amazon.com