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Other popular tourist destinations include the historic cities of Ptuj and Škofja Loka , and several castles , such as Predjama Castle .
 Ptuj, Škofja Loka, Predjama Castle
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ptuj, Škofja Loka, Predjama Castle