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The most densely populated place in history?

For those who came in late… It was Kowloon Walled City, Hong Kong (demolished 1993-4).

A thorough government survey in 1987 gave a clearer picture: an estimated 33,000 people resided within the walled city. Based on this survey, the walled city had a population density of approximately 1,255,000 inhabitants per square kilometre (3,250,000/sq mi) in 1987, making it the most densely populated spot in the world.

Wikipedia

The amazing architectural cross-section above can be viewed in detail here courtesy of Belarius with a bit of context, or here to go directly to an amazingly high-res scan.

The Walled City was already a legend when I was growing up in HK in the 80s and 90s, but I hadn’t quite really appreciated it was that dense. It makes the 77,000 peopleĀ / sq km neighbourhood up the road look positively suburban.

I'd love to hear your thoughts and recommended resources...