Ancient Megalithic Tombs

Ancient megalithic tombs - such as those at the 6,000 year old Seven-Stone Antas in Portugal - may have been the first astronomical tools used to watch the skies, millennia before telescopes were invented, scientists say.

Ancient megalithic tombs - such as those at the 6,000 year old Seven-Stone Antas in Portugal - may have been the first astronomical tools used to watch the skies, millennia before telescopes were invented, scientists say.