Especially the building of their capital city Tenochtitlan on the site of modern-day Mexico City, which was like Venice in that it was divided and serviced by canals. They also had floating gardens called chinampas, which provided food for the city. Oh, it's already time for the open letter? Alright. An Open Letter to Human Sacrifice. But first, let's see what's in the secret compartment today. Oh, nice!