Well, this part is gonna be horrific. Time to learn about the Cholera Ghosts.
It turns out that New York was the site of three cholera outbreaks. These three took place from 1829 to 1837, 1846 to 1860, and 1899 to 1923. While there is no record of cholera pits existing in New York, the worst of the outbreak hit in the 1830s. As the New York Times reported, “the epidemic left 3,515 dead out of a population of 250,000. (The equivalent death toll in today’s city of eight million would exceed 100,000.).”
One of the books about this topic is The Cholera Years: The United States in 1832, 1849, and 1866.