[HPsquared]

Cathedral projects often took decades.

[another-dave]

Ground breaking on Sagrada Familia in Barcelona was in 1882 — it was consecrated in 2010, but still not finished!

According to Wikipedia they're expecting it to take more than 5 years more, with a completion date of "post 2026"

[mmmmmbop]

Construction of the Cologne Cathedral began in 1248 and was not completed until 1880, with a generous break between 1560 and 1840. During the break, a medieval crane remained in place as a landmark of the Cologne skyline for 400 years. [0]

[0] https://de.wikipedia.org/wiki/Datei:Sch%C3%B6nscheidt,_J._H....