- 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.
- 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.
- 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.
- en.wikipedia.org OpoleIn 1521 the Duchy of Opole inherited the Duchy of Racibórz (Ratibor), by then also known by its German equivalent – Oppeln. The second castle of Opole was...
- 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...
- 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.
- commons.wikimedia.org wiki/Category:Opole_CastlePiast Tower (Opole) (3 C, 49 F). Media in category "Opole Castle". The following 14 files are in this category, out of 14 total.
- es.aroundus.com p/12353000-opole-castleOpole Castle, Castillo en Polonia. El Castillo de Opole, también conocido como el Castillo Piast, está ubicado en la ciudad de Opole.
- theculturetrip.com europe/poland/articles/the-…Tour Piast Tower. Opole’s castle (Zamek) didn’t survive years of invasion or multiple wars, so sadly it is not available for visitors.