The Shumen Plateau has many distinct caves, but the Pearl Cave, also known as Zandana Cave, is undoubtedly the most impressive, one of the 25 largest caves in Bulgaria, and the longest and most beautiful of all caves in the region, with a length of about 2716 meters, it was discovered in 1928, and it includes two galleries and an underground river. If you go on a trip to the Shumen Plateau, do not miss the opportunity to visit this amazing cave full of surprises.