29. Akershus Festning, Norway
A short distance from Oslo, Norway, you can come across a medieval castle is known as the most haunted location in Norway. Not only can you visit the remains left in the visit the crypts of King Haakon VII and King Olav V, but you can also increase your chances of seeing several ghosts from different periods.
One ghost is a faceless woman who wanders down the hallway, and another is a demon dog who guards the gates to the castle. The reason the dog is known as a “demon” is that they buried him alive so he would forever protect the castle’s gates.