Trebinje, nestled along a river in a fertile valley just over the border from Dubrovnik, is a showcase town of the semi-autonomous Serb state called Republika Srpska. It's a pleasant and relatively affluent town with a leafy main square that hosts a fine Saturday market. Overlooking the town from its hilltop perch is the striking Nova Gračanica church, with its gorgeously vibrant world of Orthodox icons. For more information on the Rick Steves' Europe TV series — including episode descriptions, scripts, participating stations, travel information on destinations and more — visit www.ricksteves.com.