In hilly Tyulbe Park, a 15-minute walk northeast of Kazanlâk's centre, is one of the archaeological finds of the century: a brilliantly frescoed, 4th-century-BC tomb of a Thracian ruler. Discovered in 1944 during construction of a bomb shelter, it's now a Unesco World Heritage site. Tragically for would-be tomb raiders, visitors aren't currently allowed inside, but you can explore the replica next door.
Along the dromos (vaulted entry corridor), a double frieze depicts battle scenes. The burial chamber is 12m in diameter and covered by a beehive dome typical of Thracian 3rd-to-5th-century-BC design. The dome's murals depict events such as a funeral feast and chariot race.