Most likely the same way the Egyptians did, building a ramp. In this case they must have built up a bridging of temporary stones between the supporting columns so they are of same level, then by building ramps on both sides to buttress the whole unit, so it is strong enough to support the overhead stone being pulled up one of the ramps, when they were done and the stone was in place, they simply removed the ramps along with the temporary bridging of stones between the columns.
Giant stones (e.g. the Stonehenge stones) from prehistoric times.
The major stones of Stonehenge are mostly sandstone, others are igneous rocks.
Yes.
There are several theories. see http://en.wikipedia.org/wiki/Stonehenge#Stonehenge_3_I_.28ca._2600_BC.29
Around the same time as the first three stones of Stonehenge
There are 92 stones at Stonehenge at the present time
It is believed that all the stones in Stonehenge weigh over 320 tons.
Stonehenge consists of a circular setting of large standing stones, known as sarsens, topped by lintel stones in the center. The outer circle is surrounded by a circular earthwork bank and ditch. There are also avenues of stones leading away from the main structure.
Stonehenge is made up of an estimated 80-82 stones, consisting of large Sarsen stones, smaller Bluestones, and other stones in various formations.
Giant stones (e.g. the Stonehenge stones) from prehistoric times.
The stones at Stonehenge have never been to London. They came to Stonehenge from Wales and archaeologists are still arguing about how they got there and how they were erected.
Stonehenge phase 1 is the circular earth works that forms the outer part of the monument. The sarsen stones and blue stones are in the center of the earthworks.
The major stones of Stonehenge are mostly sandstone, others are igneous rocks.
sarsens
Yes.
the stones in the stone hedge are as thick as 3 feet.
Because they have a bluish tinge to their colour.