I'm I correct in saying that during the early part of the 1900's the stones which form Stonehenge were re-erected into the positions as we see them know, after spending centuries lying on the ground?

Some stone have fallen and been re-erected over many years.

Most recently - 1963 - a gale knocked one over and the stone was re-erected.

But stones were also re-erected in 1958. Some stones were re-set (in danger of falling) in the early 1900's.
It think stones were re-erected as far back as the bronze age :) - found these...

Stonehenge - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Stonehenge)
Stonehenge: A New Interpretation of ... - Google Book Search (http://books.google.com/books?id=-_o7wL3nbtgC&pg=PA417&lpg=PA417&dq=stonehenge+stones+re-erected&source=bl&ots=SpQ2hUJcz-&sig=3NmMvSatoKYwMNViqYvDmTRRbew&hl=en&sa=X&oi=book_result&resnum=1&ct=result)

. some stones were re-set (in danger of falling) in the early 1900's.
it think stones were re-erected as far back as the bronze age :) - found these....

Stonehenge - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Stonehenge)
Stonehenge: A New Interpretation of ... - Google Book Search (http://books.google.com/books?id=-_o7wL3nbtgC&pg=PA417&lpg=PA417&dq=stonehenge+stones+re-erected&source=bl&ots=SpQ2hUJcz-&sig=3NmMvSatoKYwMNViqYvDmTRRbew&hl=en&sa=X&oi=book_result&resnum=1&ct=result)

Thank you StaticFX

I know the standing stones at Avebury were re-arranged early last century.
Avebury - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Avebury_stone_circle)