Atlas Obscura
Puente Romano in Mérida, Spain
A bridge built across the Guadiana River by the Romans in the 1st Century AD now serves as a pedestrian connection across the river. It's seen everything from the Romans to the Visigoths to the Moors. Restoration work was done in the 7th century and the 17th century. These days it's a quiet, though over 700m long, connection between the Alcazaba and the far side of the river.
Roman bridge across the Guadiana River, built in 1st Century AD