Monday 15 June is the 800th anniversary of the sealing of Magna Carta on Runnymede.
The barons are thought to have forded the Thames before agreement with King John was formally made in the water meadow.
Surrey County Council is now backing a plan for a visitor centre on the site having recognised that there could be a huge increase in the number of tourists visiting in subsequent years.
National celebrations are being planned and there are moves to have 15 June declared a bank holiday in 2015.
The Thames Path links Runnymede to Lambeth Palace where Archbishop Stephen Langton masterminded the agreement which has become the basis of the UK’s evolved constitution.