The gallery is the final part of the £1.2 million Lynn Museum redevelopment funded by the Heritage Lottery Fund and Norfolk County Council.

Half of the 4,000-year-old timber circle will be on display together with a reconstruction of how the circle might have looked when built.

The Bronze Age monument has been well-travelled since it was lifted from the shoreline at Holme in 1999.

Since being excavated, the 55 oak timbers first went to Flag Fen in Cambridgeshire for study before heading to the Mary Rose Trust in Portsmouth for specialist conservation treatment.

The timbers were then taken to Gressenhall Farm and Workhouse, Museum of Norfolk Life, near Dereham, to undergo finishing touches ready for a final move to its Lynn Museum home.

Seahenge was evacuated by Norfolk Archaeological Unit to avoid further erosion of the timbers which, it was later revealed, were originally felled in the spring of 2049BC.

English Heritage funded the excavation and conservation work. The museum is due to reopen in the spring, probably after Easter.