Cologne Cathedral is a High Gothic five-aisled basilica (144.5 m long), with a projecting transept (86.25 m wide) and a tower façade (157.22 m high). The nave is 43.58 m high and the side-aisles 19.80 m. Begun in 1248, the building of this Gothic masterpiece took place in several stages and was not completed until 1880. Over seven centuries, its successive builders were inspired by the same faith and by a spirit of absolute fidelity to the original plans.