The Bridge of Arta is the town's defining sight: a steep four-arched stone span across the Arachthos River, with one tall central arch and three smaller side arches that give it a strangely off-balance, beautiful silhouette. The current structure dates mainly from the seventeenth century, though it sits on much older foundations and has been rebuilt repeatedly after floods.
Walk across it slowly. The cobbled deck is humpbacked enough that you cannot see one end from the other. From the riverbank below, especially in the late afternoon when the stones glow gold and the water sits flat, you understand why this bridge ended up in folk song rather than just on a road map. A pleasant tree-shaded cafe on the eastern bank is the standard place to sit and look back at it.