Do I really have to have a favorite? I've never put any thought toward this before. Now that I am, all I can think of is though we have remnants and structures remaining from all of these ancient people, most all of them were brutal butchers of those they overtook, and even many times to their own people. I don't know how I feel about that. As once being an architecture student, I learned about all the ancient building structures, and the beauty of them. That said, they were all mostly built by slave labor. That kind of takes some of the luster out of it, despite the fact that these buildings have lasted thousands of years.