The Kölner Dom, or Cologne Cathedral, is a stunning Gothic church located in Cologne, Germany. Construction began in 1248 and was completed in 1880, making it one of the largest cathedrals in Europe. It is renowned for its impressive twin spires, which rise to a height of 157 meters, and its intricate stained glass windows. The cathedral is a UNESCO World Heritage Site and attracts millions of visitors each year. It houses many important religious artifacts, including the Shrine of the Three Kings, which is believed to contain the remains of the Three Wise Men from the Nativity story.