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Sofia has lots of very nice parks where it's not really hard wild camp. Borisova gradina, near the stadium (metro stop kliment ohridski SU or Stadion vasil levski) is the most central one, and could be visited by people at night, but beware that theft is not uncommon after dark. Zapaden Park (western part of city, metro stop Vardar or Zapaden Park) is so much bigger and less transited, really perfect for camping, not so many dogs around either.Iuzhen park (south of NDK) is a bit further away from the center, but probably a better option than Borisova to spend the night.