A replica Iron Age Roundhouse which was severely damaged by fire in March 2011 has been rebuilt.
The roof of the building had been completely burnt down, but has now been replaced.
Liz Williams, education co-ordinator at Stanwick Lakes, said: "We now have a removable Hessian roof which is put on for event days."
The house was created as part of the Rose of the Shires project which researches the heritage of local areas.
There were 500 volunteers who helped to build the house including many schools from the local area.
"It is lovely for the children to see that other people's destructive actions have not spoiled the roundhouse project," said Ms Williams.
The roundhouse has already had 280 visitors from schools.
The children got a chance to experience life as an Iron Age child would have done at 200 years ago.
There have been other archeologically finds at Stanwick Lakes including a Neolithic long-barrow.
"Lots of things went on in this valley and the River Nene is the key reason why many of the settlers came along here," said Ms Williams.
Stanwick Lakes will have an Iron Age re-enactment day on 28 May.