THE BULGARIAN CONTRIBUTION TO WORLD HERITAGE For several decades now, under UNESCO aegis, attempts have been made to preserve the planet's most valuable cultural and natural heritage. The UNESCO List of World Heritage now features over 300 landmarks. Nine Bulgarian wonders - seven cultural and two natural sites - are included among them: Rila Monastery Nessebur the Kazanluk Tomb the Sveshtari Tomb the Madara Horseman Boyana Church the Ivanovo Rock Monasteries Pirin National Park Sreburna