But for whatever reason, these northern people came through the passes that the mountains gave them into this valley, and they figured out quite quickly that this was the place that you want to settle because the land is just so fertile. So we do know around 3500 BCE, as the Egyptians were building their pyramids, these people were setting the first stones for their city walls in these villages that are going to pop up along the Indus River and all of those tributes and into that fertile plain that we talked about. Harappa and Mohenjidaro are the two biggest archaeological dig cities that they have found, and what they have found is pretty incredible. All of the cities were laid out in the same grid structure, unlike the other cities, which were really jumbled and not planned out very well. This was basically a half mile by a mile with a grid, and the grid set up residential buildings, work environments, a citadel for defense or what we think might be religious purposes. In Mohenjidaro, they found what was called the Great Bath, which was built near the citadel where it is thought that people either cleansed their souls or baptized or in holy ceremonies, and that's one characteristic of that society that is going to cross over into Hindu culture. People still bathe themselves and cleanse their spirits in the Ganges River to this day, but other than that connection, there's not as many connections that we can find with the present civilization that exists in India, with this ancient civilization that existed way back when.