- opdagdanmark.dk en/oplevelser/hammershus/Close to Hammershus is the family-friendly Hammershus Visitor Center, where you can see an exhibition that tells about the history of the castle.
- bornholmsecrets.com castles-forts/hammershus-…Hammershus Castle. Hammershus, Northern Europe’s largest castle ruin, stands on a 74-metre rocky plateau in the northwest corner of Bornholm.
- visualbornholm.com en/steder/hammershus/Whoever controlled the island resided at Hammershus and collected taxes from all over Bornholm. Consequently, common people had little affection for the castle.
- historicalragbag.com 2019/01/27/hammershus/Hammershus is the largest castle in Northern Europe and stands on a cliff 74 metres above sea level on Bornholm, a small but important island in the Baltic Sea.
- ermakvagus.com Europe/Denmark/Hammershus Castle/…With the arrival of Reformation the conflict intensified and eventually led to military conquest of Hammershus Castle by the troops of king Christian II in 1521.
- visitdenmark.com denmark/plan-your-trip/…The visitor center is built so that it adds into the landscape about 200 m east of Hammershus and separated from the castle by a gorge.
- http://jdsa.eu ham/The Hammershus Visitor Center in Bornholm is a paradox: at once a noticeable gateway to the historical site, then a hidden landscape tucked into the hill...
- arkitema.com en/project/visitors-center-hammershusArkitema Hammershus 165 Photo Rasmus Hjortshoj web. The project was designed in close cooperation with professor and architect Christoffer Harlang.
- web.archive.org web/20220818000559/https://wiki2.…Corfitz Ulfeldt and his wife Leonora Christina were imprisoned in Hammershus 1660–1661. In 1743 Hammershus was abandoned as a stronghold.