1. Freiburg is known for its commitment to environmental sustainability and is often referred to as the "Green City" due to its extensive use of renewable energy sources and eco-friendly initiatives. 2. The city features a unique medieval old town, which includes the famous Freiburg Minster, a stunning Gothic cathedral that took nearly 200 years to complete and is renowned for its impressive tower. 3. Freiburg hosts the largest university in the state of Baden-Württemberg, the University of Freiburg, established in 1457, making it one of the oldest universities in Germany and a hub for research and innovation.