Istanbul, Turkey
Istanbul is the most packed city I can remember being in. I have no idea what the overall population is, but there are apartments on top of houses, businesses under them, and so many people per square mile, it is overwhelming. And any direction that you look, you can see at least 4 or 5 mosques.
We took the long way around town and showed up too late for the actual Grand Bazaar, but shopped all around the outskirts. Inside the bazaar area things were 10 tim...