How long did it take to build the Cologne Catherdral?

The construction of the Cologne Cathedral began in 1248 and was largely completed in 1473, though some parts were finished later, with the entire structure being officially completed in 1880. This means the main construction spanned over 600 years, with a significant period of inactivity and changes in design along the way. The cathedral is a remarkable example of Gothic architecture and is now a UNESCO World Heritage Site.