Cologne Cathedral is a Catholic cathedral in Cologne, North Rhine-Westphalia, Germany. It is the seat of the Archbishop of Cologne and of the administration of the Archdiocese of Cologne. It is a renowned monument of German Catholicism and Gothic architecture and was declared a World Heritage Site in 1996. It is Germany's most visited landmark, attracting an average of 6 million people a year. At 157 m (515 ft), the cathedral is the tallest twin-spired church in the world, the third tallest church in Europe after Sagrada Família and Ulm Minster, and the tallest cathedral in the world. 157.38 m tall. Tallest structure Washington Monument from 1884 Wiki link