Oldenburg is a city in the northwestern region of Germany. It is the fourth-largest city in Lower Saxony and has a population of approximately 170,000 people. Oldenburg is known for its historical charm, with many well-preserved buildings and a vibrant cultural scene. The city is also home to the Oldenburg Castle, a former residence of the grand dukes of Oldenburg, which now houses a museum. Other notable attractions include the Lamberti Church, the Palace Gardens, and the Horst Janssen Museum. Oldenburg is also known for its excellent cycling infrastructure and is often referred to as the "bicycle city." The city has a diverse economy, with sectors such as manufacturing, services, and commerce playing an important role. Overall, Oldenburg is a lively and charming city with a rich history and a high quality of life.