| Sing Sing Prison |
|Location||New York City, United States|
|Appearances|| "You Do It To Yourself"|
"A Landmark Story"
Sing Sing Prison is a maximum security prison operated by the New York State Department of Corrections and Community Supervision in the town of Ossining, in the U.S. state of New York. It is located about 30 miles (50 km) north of New York City on the east bank of the Hudson River.
Ossining's former name, "Sing Sing," was derived from the name of a Native American Nation, "Sinck Sinck" (or "Sint Sinck"), from whom the land was purchased in 1685.
- In "You Do It To Yourself", Joan Watson meets her ex-boyfriend, who was convicted for drug possession, in Sing Sing .
- In "A Landmark Story", Sherlock Holmes meets multiple times with Sebastian Moran when he brings him news about Moriarty.
"Sing sing" as a criminal cant term for prison generally is a staple of the gangster movies genre, particularly those set around the middle of the twentieth century.