Bulgaria, so mysterious to most Americans, has a vivid identity as a crossroads of the Balkans. We'll trace the country's complex history, from ancient Thracian tombs to medieval Orthodox Christian monasteries to Soviet monuments. And we'll enjoy an intimate taste of contemporary culture: the yellow brick road of Sofia; the gregarious craftspeople of the medieval capital, Veliko Tarnovo; and the thriving pedestrian zones of cosmopolitan Plovdiv.