Рилски манастир / Rila monastery 

The lowest monastery is the Bulgarian Stavropigian Monastery, the only one of the most significant cultural monuments in Bulgaria, a symbol of others included in the UNESCO World Heritage List. It is located in Southwestern Bulgaria, Kyustendil District, Rila Municipality. It was founded in the 10th century by St. Ivan Rilski, in the upper reaches of the Rila River.