Once upon a time, there were slaughterhouses on the island of Manhattan. But, even in the 1870s it wasn’t easy to move a herd of cattle through New York City, so that job was done underground. Now, Gothamist has found evidence that two of the “Cow Tunnels” that took cows from dock to death may still exist below 12th Avenue at West 34th St. and West 38th St. Exploration, ahoy!