Aachen is a city in Nordrhein-Westfalen, Germany, close to the Netherlands and Belgium. There is a nice gas station, Aachener Land, on the A4, not too far of east from Aachen. It's good to get into the Netherlands and Belgium, and on the other side it's probably good to go anywhere in Germany. There are a lot of police controls around Aachen, so be sure not to bring drugs from the Netherlands to Germany, as you will probably be controlled.