- 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...
- 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.
- realportico.com photoportico/castle-in-tulowice-…Tułowice, powiat opolski, Opole Voivodeship, Poland, Castle, Historic Home.
- readyjetroam.com day-trip-to-opole-poland/That and Piast Tower – the last remnant of the Piast Castle built in the town in the 1300s but destroyed by the Germans in the 1930s. Our Day Trip to Opole, Poland.
- theuniquepoland.com 10-top-things-to-do-in-opoleLocated just two hours from Krakow, and one hour from Wroclaw Opole is the principal city in the region with some of the finest photographic castles in all of Poland.