In January 1999, fifty five timber posts were discovered partially buried on a beach in Holme-next-the-sea.
All of the posts were upside down trees forming a circle with the centre piece being a a large upturned oak tree. 

They were believed to have been built two thousand years before the birth of Jesus Christ, making them over 4000 years old, dating from the Bronze Age. 
English Heritage arranged to lift the structure and it has now been sited at Flag Fen near Peterborough who specialise in studying prehistoric timbers. Over the next few years the Seahenge timbers will be conserved in Portsmouth, by the Mary Rose Trust to ensure that they will be preserved for the future.

Picture kindly supplied by John Sayer who edits and publishes The Cereologist - the Journal for Crop Circle Studies.  

Click here for a fuller account of this fascinating structure, with Megalithic Mysteries, who also cover Standing Stones and Ancient Sites in Europe