- 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.
- 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...
- 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.
- realportico.com photoportico/castle-in-tulowice-…Castle for sale in Poland: Karłowice Character Properties, Castle for sale in Poland: Karłowice. ... Sell a castle or a historic property in Opole Voivodeship.
- 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...
- commons.wikimedia.org wiki/Category:Opole_CastleP. Piast Tower (Opole) (3 C, 49 F). Media in category "Opole Castle". The following 14 files are in this category, out of 14 total.
- 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.
- tr.wiki7.org wiki/Опольский_Верхний_замокOpole Yukarı Kalesi ( Lehçe : Zamek Górny w Opolu ), Opole Piasts'ın eski bir malikanesi olan Opole'deki iki kaleden biridir .