Siena Cathedral, or Metropolitan Cathedral of Saint Mary of the Assumption as its full name is, was built between 1215 and 1263 - which for a cathedral is very fast as these usualy take 100+ years to finish. The city council saw this and saw that it was good. Then the city council decided "to put Siena on the map" and other PR-consulting tropes from the year 1300, and committed to expand it to the largest cathedral in the region. The construction soon turned into a nightmare: the money ran out before even one tenth of the job was done, what was done was of sub-standard quality - and to top it off the plague struck. From the abandoned, half-finished marble walls that today frame a parking lot we learn that municipal politics haven't changed in 700 years.