There are probably hundreds of myths and legends about Stonehenge. Various people have attributed the building of this great megalith to the Danes, Romans, Saxons, Greeks, Atlantes, Egyptians, Phoenicians Celts, King Aurelius Ambrosius's, Merlin, and even Aliens.
One of the most popular beliefs was that Stonehenge was built by the Druids. These high priests of the Celts, constructed it for sacrificial ceremonies. It was John Aubrey, who first linked Stonehenge to the Druids. Additionally, Dr. William Stukeley, another Stonehenge antiquary, also claimed the Druids were Stonehenge's builders. Stukeley studied Stonehenge a century later than Aubrey and became so involved in the study of the Druid religion that he himself became one. Through his work he was very instrumental in popularizing the theory that Stonehenge was built by Druids.
At Stonehenge human remains were found as well as tools used to help constructing the henge.
To stiffen the floor frame.
The interstate highway system was designed to be used as military runways.
The Pythagorean theorem was used in ancient times to calculate the lengths of sides in right-angled triangles, which helped in solving geometric problems and designing architectural structures with precise measurements.
It was not used as a barometer.
used for a clock
Pagans.
limestone
the most common angle used in constructing building is 90 degree.
Stonehenge has not been used for thousands of years so no one knows the answer to this.
Wood is commonly used for constructing board and batten structures.
Stonehenge has no official ceremonial use today, other than a tourist attraction.