Four roads meet here. If you pay attention, you will find that there is an indistinct line of demarcation between Oxford's business district and the college district, and the Carlfax Clock Tower is on the border - 14th century university teachers, students and citizens The melee happened here. The Calfax Clock Tower is the only remnant of St. Martin's Church. The history of St. Martin's Church can be traced back to the 11th century. During the continuous expansion of the road in the 19th century, the church and the fountain were demolished successively, and only the bell tower remained. Calfax Clock Tower has a total of 99 steps, and the tower can overlook the buildings and gardens of the colleges and universities.