There are multiple theories with the one that appears the most being related to pagan ceremony. The postions of the stones provide clues that lead scientists to believe they had something to do with the summer and winter solstice, and early religious ceremonies that celebrated the changing seasons. However, most of what has been learned about Stonehenge thus far is still theoretical. National Geographic magazine had a feature about Stonehenge about a year ago (link attached) that you may find interesting. The greatest questions are: how did early man get the stones from the quarry all the way up to the plateau and lift them into place? And perhaps more importantly, how did they so accurately set out such massive stones - to what was clearly a precise and premeditated plan, and what cosmological model determined that plan?
Speculation on the reason it was built range from human sacrifice to astronomy.
There are several theories. see http://en.wikipedia.org/wiki/Stonehenge#Stonehenge_3_I_.28ca._2600_BC.29
The weight one stone in Stonehenge has been presumed to be between 20-25 tons each stone and if you need more information it was built between 8000 and 1500 B.C. the Stonehenge itself was originally began around 8000 B.C. but the main construction was around 3000-2000 B.C.
stonehenge
No. Stonehenge is in Wiltshire, England.
Yes the Stonehenge is still standing.
Nobody knows. Stonehenge is one of the world's greatest mysteries. There are theories that Stonehenge may somehow be related to the solar or lunar cycles or to the positions of the stars. But because nobody knows who built it or exactly when, it's difficult to know what was going on in the sky at the time of its construction to try and match Stonehenge to astronomical events
The construction of Stonehenge took several centuries, but the start of the construction is most likely near 3100 BC.
Stonehenge was produced by a culture that left no written records. Many aspects of Stonehenge remain subject to debate.
As Stonehenge was constructed long before written records were kept there is no recorded evidence of any construction problems.
dome architecture
There are several theories. see http://en.wikipedia.org/wiki/Stonehenge#Stonehenge_3_I_.28ca._2600_BC.29
The construction of Stonehenge.
Speculation on the reason it was built range from human sacrifice to astronomy.
For an excellent rendition of the creation and construction of Stonehenge, you should read Edward Rutherford's book, "Sarum." It's historical fiction, but it contains the best possibility for construction I have read (and is an excellent book).
Their are many theories. We know that the stone came from Wales. None the less still a mystery.
Megalith
Because the people who built Stonehenge left no written records, the purpose of its construction is still a matter of debate. Some have suggested Stonehenge may be a burial ground, while others believe it was a place of healing