When we hear people talk about pyramids, we can't help it, but to think about Egypt, Mexico central America, and a few other well known places.
Few people know about the Greek pyramids one of which is the pyramid of Hellenicon. (photo)
Recent carbon dating proves it to be 150 years older than the great pyramid of Cheops in Egypt.
But unlike the pyramids in Egypt, it is not exactly known what it was used for.