Polish Tourist and Sightseeing Society
The Polish Tourist and Sightseeing Society (Polish: Polskie Towarzystwo Turystyczno-Krajoznawcze, PTTK) is a Polish non-governmental tourist organization with 312 branches across the country. The PTTK is one of the oldest tourist societies in Europe.
Source: Wikipedia — Polish Tourist and Sightseeing Society (CC BY-SA 4.0)