At the 15th century, the construction of the defensive system of the abbey being completed, the protection of the city was considered. Three doors defend the entry of the city. The first, coupled with the body of guard of the middle-class men, is known under the name of door of the Projection. Its defenses are summary. The second door, defended by one fears and a half-moon, is called the door of the Boulevard. The most defensive door is without question that of the King, protected by the turns from the Arcade and of King, it could be crossed with difficulty because a drawbridge and a harrow barred the passage of it.

Passed the threshold of the door of the King, the visitor is under an arched passage which acted as body of guard. The parts located at the top of this passage shelter the town hall of the Michaelmas Mount today. You now have in front of you Main street. Single street of the Mount, it turns around the rock to lead the visitor to the foot of the great external degree. The summer, the rise of the street is done, between the shops of merchants of memories, in the middle of a compact and cosmopolitan crowd. It becomes under these conditions very difficult to appreciate constructions bordering this street and better is worth to leave it without regrets. Then, to borrow the alleys and other passages deserted by the tourist avid from bimbeloteries allows replonger in one time when the beauty of the things makes us forget the vicissitudes of the current life.