Trier Cathedral, also known as St. Peter's Cathedral, is located in Trier, Germany. It is one of the oldest cathedrals in the country, with its origins dating back to the 4th century. The cathedral showcases a mix of architectural styles, including Romanesque and Gothic, reflecting its long history and various renovations. The cathedral is home to several important relics, including the Holy Robe, believed to be the garment worn by Jesus Christ. It is a UNESCO World Heritage site and attracts many visitors each year, making it a significant landmark in Trier and a key part of the region's cultural heritage.