![Mark Walters on Twitter: "Looking at some fortification architecture in Norway with the Norwegian Mapping Authority @kartverket #LiDAR data. Fredrikstad (1663-1666), Oscarsborg (1846-1890), Kongsvinger (1682) and Vardohus (1738) https://t.co/arwwWXXt0H ... Mark Walters on Twitter: "Looking at some fortification architecture in Norway with the Norwegian Mapping Authority @kartverket #LiDAR data. Fredrikstad (1663-1666), Oscarsborg (1846-1890), Kongsvinger (1682) and Vardohus (1738) https://t.co/arwwWXXt0H ...](https://pbs.twimg.com/media/DTYcrWsXcAEu5Hu.jpg:large)
Mark Walters on Twitter: "Looking at some fortification architecture in Norway with the Norwegian Mapping Authority @kartverket #LiDAR data. Fredrikstad (1663-1666), Oscarsborg (1846-1890), Kongsvinger (1682) and Vardohus (1738) https://t.co/arwwWXXt0H ...
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