Fun Fact: On August 14, 1880, the Cologne Cathedral in Germany was finally completed after being under construction for 632 years. Its completion became a symbol of German unity and architectural achievement, and today the cathedral stands as a UNESCO World Heritage Site, admired by millions for its stunning Gothic architecture.by johnataylor on TwosFun Fact: On August 14, 1880, the Cologne Cathedral in Germany was finally completed after being under construction for 632 years. Its completion became a symbol of German unity and architectural achievement, and today the cathedral stands as a UNESCO World Heritage Site, admired by millions for its stunning Gothic architecture.