St. Peter's Basilica
In 1505, Pope Julius II decided to demolish (pull down) the old St. Peter's and build a basilica that would be the grandest church in the world and make Rome (and himself) famous. He held a competition and invited lots of artists and architects to draw designs. A plan was selected and the build was begun, but Pope Julius did not get his new basilica. In fact, it was not finished for 120 years. The planning and construction (or "building work") lasted through the reigns of 21 popes and 8 architects.