. ♪ ♪ ♪ ♪ >> anthony: morning prayer in isfahan. [ men singing ] >> anthony: across town, the khaju bridge [ men singing ] >> anthony: across town, the khaju bridge where men gather spontaneously to sing. [ men singing ] is this okay, this impromptu giving oneself over to the creative urge? to stand and sing out to no one in particular? maybe, but not okay, apparently, to film. >> tom: come on. we gotta go. we gotta go. ♪ the road back to tehran. along the way, reminders of just how far back this culture goes. the ruins of ancient caravanserais, highway rest stops from when armies, merchants, traders travelling by camel, by foot, all passed along these same routes. this, right here, a stop on what was once the silk road, extending all the way to china. ♪ ♪ in this part of the world, whatever your background, bread is a vital, essential, fundamental, and deeply respected staple. and mornings in tehran, countless bakeries like this one turn out as much as they can. oh man. smells good in here. >> babak: you have to stay in line. >> anthony: no problem. standing on line is a daily part of lif