Cologne Cathedral is a landmark of the city of Cologne, Germany and one of the most magnificent Gothic churches in Europe. Built in 1248, the church took over 600 years to complete, and with its 157-meter-high tower, it was once the tallest building in the world. The interior of the church is ornately decorated and boasts a wealth of religious artwork, the most famous of which is the relics of the Holy Three Kings. Cologne Cathedral is not only a Catholic religious shrine, but also a UNESCO World Heritage Site, attracting thousands of tourists to visit and experience its unique historical and cultural charm.