The German city of Singen is in Baden-Württemberg, close to the Swiss border. Like many towns and cities in Germany the area has been inhabited for thousands of years. The countryside around the city is absolutely stunning - if you hire a car in Singen, you will be able to travel into Zurich and other parts of Switzerland.
You can also drive out and see Lake Constance, the Black Forest or the Rhine Falls - the potential for day trips is extensive. There is a lot of military history associated with the area, as the 'Singen Route' was how soldiers travelled to Switzerland during World War Two.
Singen is both a historic and industrial town, with historical links as far back as Neolithic times. It was along the route to Switzerland for soldiers in World War 2, and part of the local scenery is a volcanic stump called the Hohentwiel, which has the ruin of a Napoleonic fortress on its slopes. The mountain is not too difficult to climb, so it's suitable for a family day out.
The city is connected to the rest of Germany and to Switzerland by several major highways, making hiring a car in Singen the best way to make the most of the area.