Aachen Cathedral, also known as the Imperial Cathedral, is a historic landmark of western Germany. It is renowned for its Palatine Chapel, which dates back to the time of Charlemagne and is a masterpiece of Carolingian architecture. This cathedral has the distinction of being one of the oldest in Europe and was the first German site to be listed as a UNESCO World Heritage Site. Its rich history and architectural significance make it a pivotal site for both religious and cultural heritage. The cathedral also houses important religious relics and has been a site of coronation for German kings and queens of the past.