The Prince Hall Mystic Cemetery, also known as the Prince Hall Cemetery, is a historic cemetery located on Gardner Street, Arlington, Massachusetts. It is said to be the only remaining African American Masonic cemetery in the United States. As time passed it was forgotten until its rediscovery in 1987. It was rededicated in 1990, and added to the National Register of Historic Places in 1998. Today the cemetery is the last extant cemetery associated with Prince Hall Masons. It contains a small park with a monument. A 1988 survey found remains of the original gate and an obelisk.