An hollow abutment. Necessary to let the bridge have less weight than if it were full of stones.

The oldest of the towers is also the most easily accessible. This tower is almost completely hollow, even if it is assumed that this was not always the case. The highest point we can go is the small black window. Here, an association has installed a niche falcon. Often, about 5am, he hangs in the air, turning alternately around the two towers. Sometimes we hear it scream and break this silence of the night. Guaranteed effect!