Of course if you go to York you have to visit the cathedral York Minster which is one of the largest in Britain. An amazing building it is too with parts of it dating from the 13th to 15th centuries.
The first church on this site dates from the 7th century when a wooden church was built to baptise the King of Northumbria in 627. Stone churches were built on the site but were destroyed a number of times such as in 1069 when it was destroyed by William the Conqueror. Building in the Gothic style began in 1215 with construction continuing for years until it was declared complete in 1472.
You can see much of this in the photos i took over a couple of days at the Minster.