3 Best Sights in Trondheim to the Lofoten Islands, Norway

Part of Nazi Germany's coastal defense system, this massive naval gun was originally built to be used on a ship during World War II. The "Adolph Cannon" is now part of an interactive museum where you can explore its inner workings and see examples of the different types of missiles it could have fired. The gun is the last of its type left in the world, and is a reminder of the country's tragic history.

History enthusiasts love this World War II bunker. Although it has been swallowed up by nature and is pretty rusty, it still tells a powerful story.

Built by J. C. Cicignon after the great fire of 1681, the Kristiansten Fort saved the city from conquest by Sweden in 1718. During World War II, the German occupying forces executed members of the Norwegian Resistance here; there's a plaque in their honor. The fort has spectacular views of the city, the fjord, and the mountains. Some walls are unsecured, so take care when walking, and mind your children.