St. Peter's Basilica
It is claimed construction began in 1506 and finished in 1626. Notice there are no roads to carry material for the construction. Notice how there are running water fountains, but during this time (16th-17th Century paintings) people didn't even have toilets.
Another interesting thing about these pictures, that could perhaps be pointing to the aftermath of a recent mudflood, are the large and varying amounts of dirt on the floor in several of the attached pictures and how it seems they are still digging up the floor beneath, with the sides being piled up with dirt.
