This hugely popular day trip carries visitors from Thessaloniki to Meteora, the extraordinary complex of Eastern Orthodox monasteries perched atop towering natural rock pillars in central Greece. A UNESCO World Heritage Site, Meteora combines dramatic geology with centuries of monastic life, and the tour typically includes visits to several monasteries, sweeping viewpoints and time to admire the frescoes and the setting. With comfortable transport and a guide sharing the history and legends, it is one of the most rewarding excursions from the city.