Oscarsborg Festning, an Ascend Collection Hotel

Set in former barracks, this laid-back hotel is a 3-minute walk from the museums at the 19th-century Oscarburg Fortress that guarded the Inner Oslofjord, and 2.1 kms by ferry from Drøbak. The airy rooms feature flat-screen TVs and Wi-Fi. Some have sea views. The hotel offers a restaurant, and group activities and games exploring the fortress. Other amenities include a conference centre,...