A “fantastic group of volunteers” have built a replica of the Iron Age roundabout on a great Bronze Age causeway dating back 3,500 years.
Building at Flag Fen, near Peterboroughit took six months to complete, using locally sourced oak, ash and hazel.
General manager Jacqui Mooney said it had been “a real labor of love.”
Time Team archaeologist Francis Pryor, who discovered Flag Fen in 1982, will lead a topping-out ceremony later.
Ms Mooney said: “There are many different Iron Age roundhouse designs, they are not all the same.
“We’re based on one discovered in Cats Water, off Flag Fen, in the 1980s.”
The volunteers were led by expert builder David Freeman, who is Flag Fen’s assistant general manager.
He learned his skills at the experimental archeology site. Butser’s Old Farm in Chalton, Hampshire.
Ms Mooney said: “We have been supported by a fantastic group of volunteers, some 20 at one stage, but Emma Bothamley, Arthur Randall and Katherine Piper have been complete soldiers in all climates, hot and cold, working hard.”
Flag Fen has been described as one of Britain’s most important Bronze Age archaeological sites, its centerpiece being the remains of a wooden causeway on stilts that was built over the marshy landscape.
Excavation of the causeway began in 1982 when millions of preserved timbers were found covering more than half a mile (0.8 km) of Fenland.
“Around 10,000 school children visit each year and now they will have an Iron Age roundhouse to visit along with replica Stone Age and Bronze Age houses,” he said.