36.- Bridge of Colloto It is an early Roman Imperial bridge. A treasure of coins appeared on the central pillar arch. These coins were from the 4th and 5th centuries. It is located on the old route that comes from Cantabria and links to the city of Lucus Asturum. The current work looks medieval. as one of its arches are pointed. The bridge has a ridged outline and a double ramp at the axis. It is formed by two bridges that have different formats. one is pointed and the other is semi-circular. They are both supported by a strong pillar located in the river bed. The walls are built with irregular masonry that is worked with lime and sand. Stone blocks are used in the borders of the arches. cutwater. breakwater and the butresses. This bridge was declared a Cultural Interest Site in 2003.