- en.wikipedia.org OpoleOpole developed during the rule of duke Bolko I of Opole. The castle was finally completed around this time and new buildings...
- medievalheritage.eu en/main-page/heritage/poland/…Opole – castle on the Ostrówek. reconstruction of the castle in the late Middle Ages, photo source Wikimedia Commons.
- tripadvisor.com Attractions-g274776-Activities-…Top Opole Castles: See reviews and photos of Castles in Opole, Poland on Tripadvisor.
- OpenTripMap.com en/card/Q1776945Piast Castle in Opole, photographed in 1925. It was demolished between 1928-30 although the tower was preserved. by Max Glauer.
- http://polishcastles.eu castles/opole/opole.phpHistorical outline: Former name: Oppeln. In the past two castles existed in Opole: one was situated on Ostrówek island, and the second on so-called Górka.
- staypoland.com castles-and-palaces-of-the-opole-…Today, after a complex renovation, visitors can attend a multimedia exhibition about Opole’s history, the Piast Castle, and the tower itself.
- thingstodopost.org top-10-castles-in-opole-…Opole Voivodeship, or Opole Province (Polish: województwo opolskie [vɔjɛˈvutstfɔ ɔˈpɔlskʲɛ], German: Woiwodschaft Oppeln), is the smallest and least...
- nl.aroundus.com p/12353000-opole-castleOpole Castle, Kasteel in Polen. Het kasteel van Opole, ook bekend als het Piastenkasteel, is gelegen in de stad Opole.
- theuniquepoland.com gorny-castle-opoleSearch. gorny-castle-opole. By Bartosz.