Cicignon was the mastermind behind the Kristiansten Fort up on the hills to the east of the city. The fort was built after the great city fire in 1681, and now stands guard over the city. It saved the city from conquest by Sweden in 1718. From the fort, there is a spectacular view over Trondheim and its surroundings, the fjord and the mountains.
Under German occupation from 1940 to 1945, the fort was used as a place of execution for Norwegian members of the Resistance. A plaque has been erected in their memory.
Opening Hours: The gates of the fort are open while the flag is raised, but the building and rooms inside are open only from June-August: Monday- Friday 10am-3pm, Saturdays and Sundays 11am-3pm.