The Church of the Panagia tou Vlakherna is a former monastery church known for its unusual triple-domed basilica form. Its varied apses, brickwork, and sculptural details make it one of the more distinctive Byzantine-era monuments around Arta.
It is worth seeking out if you are visiting Arta for its churches, castle, and old bridge. The building rewards a slower look at the exterior details, not just a quick photo stop.