A visitor prays at the gravesite of the Lubavitcher Rebbe, Rabbi Menachem Mendel Schneerson, at the Old Montefiore Cemetery in the Queens borough of New York June 30, 2014. Monday evening and all day Tuesday mark the 20th anniversary of the Rebbe's passing with organizers estimating 50,000 visitors to the site in tribute to the late Jewish leader. REUTERS/Shannon Stapleton (UNITED STATES )