Halden Fortress, or rather Fredriksten Festning, to give it its real name, was built in the 17th century in a bid to protect the country’s border against attacks form its belligerent neighbour to the south. Perched on a hill facing Sweden across Iddefjord, one of eastern Norway’s deepest fjords, the fortress is quite a sight, particularly when lit up at night. It is used for many events throughout the year, including outdoor concerts and an opera festival in summer, and a Christmas market in December.

The fortress is open to visitors year round. You can join a guided tour (including a ghost tour for children) in season or explore the compound at your leisure, with or without an audioguide. Fredriksten fortress is home to a museum, several restaurants, a shop and a tourist information centre. In addition there is also a golf course and a campsite (open in season only) within the grounds, just outside the walls. The fortress is a hugely popular attraction – 290,000 people visited last year (2009), more than ever before. Entry is free (charge for the museum).