Come to the world inside the geography textbook! Stonehenge

It is really hard to imagine how people 5,000 years ago transported the stones here. Ancient people were really very wise! This Stonehenge is an old calendar, where you can observe the light and shadows of the sunrise. According to records, Stonehenge should have been built in different periods. The stones are divided into three types. Phase 1: The innermost circle is the "blue stone" The bluestones (each weighing 2-5 tons) were collected from a place 250 kilometers away. The Prisley Hills in Pembrokeshire, west Wales (Preseli hills) The rocks in the outer circle are "sandstone" Weighing 23 tons, it was transported from a small town in southern England 40 kilometers away. Finally, the Altar Stone was discovered only a few years ago. This incredible stone, lying on its side in the center of Stonehenge, is incredible It came from Scotland, 850 kilometers away. I don't know how this stone was transported here. of!! Say something...