Archeologists believe that stonehenge was built between 3000 BC and 2000 BC. There is much debate as to what stonehenge really was but most people believe it was a astrological calendar that was used to measure the cyclical nature of the universe, basically an ancient calendar of the stars.
A Russian website has posted images of Stonehenge being rebuilt in the early 1900’s. The only thing is our history says nothing about a rebuild.
Here are some images of the construction
Here are the images of base preparations
Here are some other photos of ceremonies and some workers