The north side of Groningen is best known for its city beach, but around Christmastime it becomes the home of what is (probably) the world’s biggest Christmas bauble, in the form of an old planetarium dome covered with thousands of lights. The DOT was once known as the Infoversum when it was built by the city in collaboration with the local astronomy department. Finished in 2014, it was meant to draw around half a million visitors to its planetarium shows and 3D cinema experiences. However, only about 80,000 people came,…