There are some fine churches in Oxford, notably the university church of St. Mary the Virgin, conspicuous from its Decorated spire rising one hundred and eighty-eight feet, which is a memorial of Queen Eleanor of Castile. A short distance to the westward is All Saints Church. Fronting Christ Church is St. Aldate's Church, also with a lofty spire and Decorated tower. Like most English towns, Oxford had a castle, but its remains are now reduced to a solitary tower, a few fragments of wall, and a high mound. This castle has long been the property of Christ Church, and was used for a prison, whence Cranmer and his fellow-martyrs went to the stake. The old tower was built in the days of William Rufus. Beneath the ruins is a crypt known as Maud's Chapel. In the centre of the mound is an octagonal vaulted chamber, approached by a long flight of steps, and containing a well. It was in this castle that the empress Maud was besieged by King Stephen in 1141, but escaped in the night, the castle surrendering next morning. The ground was covered with snow at the time, and the empress, with three attendants, clad in white, passed unnoticed through the lines of the besiegers and crossed the Thames on the ice. Just before this Maud escaped from the castle of Devizes as a dead body drawn on a hearse. The castle of Oxford has been in a dilapidated condition since Edward III.'s time. As an evidence of the change of opinion, the Martyrs' Memorial stands on St. Giles Street in honor of the martyrs who found the old tower of the castle their prison-house until the bigots of that day were ready to burn them at the stake in front of Balliol College. [Illustration: ALL SAINTS, FROM HIGH STREET.]