As well as being a parish church, the church of St. Mary has been a university church since the 12th century, making it historically important to the city of Oxford. It, like many other historic buildings in Oxford was part of the final days of the three martyrs, Cranmer, Latimer, and Ridley, it was the site of their trial for heresy in the 1550s. The 13th century spire is very impressive, being one of the oldest parts of the church. The view over Oxford from the top of St. Mary’s is excellent, with views over the colleges that rival those from the tower of St. Michaels in beauty. The church pinnacles are very much the Eiffel Towers of Oxford. There are also the great stone gargoyles to greet you at the top.

Entry to the church itself is free, but there is a nominal charge to climb the tower. St. Mary's is open from 0900- 1900 during July and August, and until 1700 during the rest of the year.

The barley twist columns in the front area of St Mary’s are very unusual for their architectural style.