1. Akershus Fortress
Akershus Fortress is one of the most significant fortresses in Norwegian history, strategically located on Akersneset in Oslo. Originally built as a medieval royal castle in the late 13th century, it was later transformed into a Renaissance palace surrounded by a bastion fortress in the 17th century. For over 700 years, this fortress has withstood several sieges but was never captured by a foreign army. Today it houses the Norwegian Armed Forces Museum, the Resistance Museum, and serves as a venue for official ceremonies. The grounds offer stunning views of the harbor and Oslofjord.