The construction of Stonehenge took place in the time of four periods; Period I, Period II, Period III, and Period IV.

Period I, the Neolithic period, dates back to 3100 BC. It was made of a circular ditch about 330 feet in diameter. It contained an eternal bank and a northeast entrance. Also at this time were the four Station Stones. Only two of these stones are still there today. There is also an earthwork stone which runs from the break of the bank to the ditch. The Slaughter Stone that has now fallen is located at the break in the bank; the ditch might be from that period as well. Inside the bank there are 56 holes which were dug 285 ft. in diameter. The holes were discovered by John Aubrey. The Heel Stone(which got its name from a legend) may also have come from this period.

The Beaker Culture people made an earthwork boulevard that earned the name of "the Avenue".
It was used as an entrance to the bank and the ditch. The Culture brought a bluestone from Preseli Mountain in southwestern Wales. They used this stone to make the "double circle". The circle was never finished. Both of these new additions to Stonehenge faced toward the summer solstice sunrise. Other stones were used to make a gorse shoes shape called the trilithons. They were then closed with a circle of about 108 ft. made originally by using 30 tidy trimmed tall stones. On the the day of midsummer, a person standing in the middle of the circle can see the sun rise right above the Heel Stone.

A circle made by a horseshoe-shape was made of upright stone blocks (also known as sarsens). The stones were put together with hammers. They also made other changes like moving the stones, adding some, and rearranging others . The stones had been used in the second period. Others were erected again in an oval structure. Two more holes were dug to contain trilithons. This was also unfinished, and the stones were moved in a horseshoe-shape.

Not much happened in this period! All I have to say is that the Avenue was extended to a river 1.25 miles away.