3Cologne Cathedral, Germany
Cologne Cathedral, a UNESCO World Heritage site, is a stunning example of High Gothic architecture. Its twin spires, which were the tallest structures in the world upon completion in the 19th century, are an iconic symbol of Cologne. The cathedral houses the Shrine of the Three Kings, believed to contain the relics of the Magi. The intricate façade, vast interior, and beautiful stained glass windows attract millions of visitors each year.
