If you continue the Carrer De la Merceria you will reach an impotent stone stairway that leads to the great Cathedral. It was built in the highest point of a hill and it is the center of the old quarter. It was finished in 1331 and it is a great example of the transition of the Romanic to the Gothic style. In the surrounding square, you will find medieval buildings. In that square, take place the human towers called Castellers, of great tradition in the city, and declared Intangible Cultural Heritage of Humanity by Unesco.