1. Aachen is home to the famous Aachen Cathedral, a UNESCO World Heritage site, which is not only a stunning example of Carolingian architecture but also the burial site of Charlemagne, the first Holy Roman Emperor. 2. The city hosts the annual Aachen Christmas Market, one of the oldest and most delightful Christmas markets in Germany, attracting visitors with its festive atmosphere, local crafts, and seasonal treats. 3. Aachen is known for its thermal springs, which have been in use since Roman times. The city has a rich spa culture, and the Carolus Thermen spa offers visitors a chance to relax in the healing waters, continuing the tradition of wellness that dates back centuries.