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Prince Christians Battery on the tip of Vallo, protected Norway's only saltworks in 1808-14. The Battery together with cannons and cannonball oven was restored 1986-89. Admission with guide during summer.
This place is not available to the public by land. Only on guided tours by the Tønsberg guides. I went with a kayak. It has a couple of canons and it was used for defence. Now it is inside the Esso owned closed area.