Via Thomas Kole, check out this reconstruction of Tenochtitlan, the awe-inspiring island-metropolis of the Aztecs: “The year is 1518. Mexico-Tenochtitlan, once an unassuming settlement in the middle of Lake Texcoco, now a bustling metropolis. It is the capital of an empire ruling over, and receiving tribute from, more than 5 million people. Tenochtitlan is home to 200.000 farmers, artisans, merchants, soldiers, priests and aristocrats. At this time, it is one of the largest cities in the world.” If I could borrow a time machine, this is the first place I would visit! Hat tip: Marginal Revolution.
prior probability 