The Kölner Dom took 632 years to complete. Construction began in 1248 and was finally finished in 1880, making it one of the longest building projects in architectural history. Towering above Cologne with its iconic twin Gothic spires, Kölner Dom still st

The Kölner Dom took 632 years to complete. Construction began in 1248 and was finally finished in 1880, making it one of the longest building projects in architectural history. Towering above Cologne with its iconic twin Gothic spires, Kölner Dom still st