Durham Cathedral Museum has an exhibition on from now until 2 November, about the Magna Carta.
It features the only surviving copy from 1216, as well as copies from 1225 and 1230, as well as three forest charters.
Entry to the Museum is £7.50, but the Cathedral itself is free.
There is also accompanying artwork around the nave and in the Galilee Chapel.
https://durhamcathedral.ticketsolve.com/ticketbooth/shows/1173658999
https://durhamcathedral.ticketsolve.com/ticketbooth/shows/1173660729
I only found out about this when checking on a week of Choral services by St Mark's Cathedral, Seattle Evensong Choir during the second week of August.