The Šargan Eight tourist train, stationed in Mokra Gora, was once part of a narrow-gauge railway linking Belgrade with Sarajevo and Dubrovnik. The joy of the 2½-hour round-trip is in its disorienting twists, turns and tunnels (all 22 of them). The vintage train chugs past some stupendous mountain scenery, but hang on to your camera; it's a long way down.