Overview
The entire municipality has a typical karst landscape. One of Slovenia's major tourist attractions, Postojna Cave, is located in the municipality. The cave was first described in the 17th century by Johann Weikhard von Valvasor, and a further major part of the cave was discovered in 1818. Electric lighting was added in 1872, increasing the cave system's popularity. A second popular tourist attraction, located approximately 9 km from Postojna, is Predjama Castle, a 16th-century castle built in the mouth of another karst cave.
The parish church in the town is dedicated to Saint Stephen and belongs to the Koper Diocese. Within the urban area of Postojna, the church dedicated to the Prophet Daniel in the hamlet of Zalog and the chapel dedicated to Saint Lazarus at the town cemetery also belongs to this parish.
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