Stonehenge means "hanging stones". They stood in a circle, with 30 more stones lying on top to form a ring of rocks. There was also an inner circle built with similar stones. The stones set up in a trilithon(巨石牌坊) pattern.
A trilithon is made of two stone pillars with a stab of rock laid across the top. The stones weigh up to 20 tons each. People wonder how the huge rocks were placed that way.
Historians agree that Stonehenge was built in three different stages. The first stage took place about 5, 000 years ago. At that time, a large circular earth wall was made. Historians believe the wall was dug and cut with tools made form anglers(鹿角) of red deer. The earth wall was about 98m in diameter(直径) a 5-meter-tall stone was placed near the center. Then, they had to transport the large blue stones (up to 4 tons) 384 kilometers to Stonehenge. Experts think they might be moved across ice and snow. The ground in winter in this area is usually full of ice and snow, making it easier to move the rocks. The next task was to stand the stones up. The most difficult task was putting the top stones in place. Each one of these tasks took a lot of planning and a lot of strength, but the workers of Stonehenge were excellent builders.
Why was the monument built? Some scientists think it's a burial ground. There are over 400 graves (burial sits) nearby. A man was buried with two gold earrings which are the oldest gold ever found in Britain (dated to 2470 BC). Others think Stonehenge was built by early astronomers. Scientists believe that when a person stands in the center of the monument, the changing of seasons can be seen. Certain stones mark the location of the rising and setting moon in midwinter. Other stones mark the rising and setting sun in midsummer. The ancient people held religious ceremonies on these days. These ceremonies probably asked the gods to bring good weather for crops and to protect the people from bad weather.
Stonehenge is an engineering success. Thousands of years later, it still stands. As a calendar, Stonehenge is very accurate. It shows that early people had a deep understanding of the movements to the sun and the moon. They didn't have machines or computers, but Stonehenge shows people could do many things using only their muscles and their brains.
