Dortmund

1. Dortmund is home to the largest beer festival in the world, known as the "Dortmunder Oktoberfest," which celebrates the city’s rich brewing history and attracts thousands of visitors each year. 2. The city has a unique underground tunnel system known as the "Dortmund U," which was originally built for the transportation of coal and now houses a cultural center and various exhibitions. 3. Dortmund is a significant hub for computer science and technology, hosting the "Dortmund University of Applied Sciences and Arts," which has a strong emphasis on research and innovation in areas such as artificial intelligence and robotics.