Bielefeld is a city located in the northwestern part of Germany, in the state of North Rhine-Westphalia. It has a population of around 330,000 people and is known for its rich history, dating back to the 13th century. The city features a mix of modern and historical architecture, including the iconic Sparrenburg Castle. Bielefeld is also home to several universities, including Bielefeld University, which is recognized for its research and academic programs. The city offers various cultural attractions, such as museums, theaters, and parks, making it a vibrant place for both residents and visitors.