Enigmatic archaeological site in Madagascar may have been built by people with Zoroastrian origins, research suggests

At the turn of the first millennium AD, an unknown group of people lived in the inland Isalo massif of southern Madagascar. Here, they built vast terraces and carved large stone chambers and small hollow rock niches. The architecture is unlike anything else found in Madagascar or the adjacent East African coast. Who built these structures, when they arrived, and why was unknown.