by Rena, Learning Mind The only known prehistoric underground temple worldwide is located in Malta. Dating back to 5.000 B.C, “Hypogeum of Hal Saflieni” or simply “Hypogeum”, from the Greek word hypo (under) and gaia (mother earth) is an underground construction, which consists of interconnecting chambers in three levels. Hypogeum, carved into 2.000 tons of … Continue reading This Prehistoric Underground Temple Hides the Unexplained Mystery of Elongated Skulls