- 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.
- 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.
- 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.
- 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.
- en.wikipedia.org Strzelce Opolskie Castle1.2 Bibliography. Toggle the table of contents. Strzelce Opolskie Castle. 6 languages. ... Historic site in Opole Voivodeship, in Poland. Strzelce Opolskie Castle.
- tripadvisor.com Attractions-g274776-Activities-…Top Opole Castles: See reviews and photos of Castles in Opole, Poland on Tripadvisor.
- theuniquepoland.com gorny-castle-opoleSearch. gorny-castle-opole. By Bartosz.
- commons.wikimedia.org wiki/Category:Opole_CastlePiast Tower (Opole) (3 C, 47 F). Media in category "Opole Castle". The following 14 files are in this category, out of 14 total.
- en.m.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...