A Requiem Mass was held for Kennedy at the Cathedral of St. Matthew the Apostle on November 25, 1963. Afterwards, John F. Kennedy's body was buried in a small plot, (20 by 30 ft.), in Arlington National Cemetery. Over a period of 3 years, (1964–1966), an estimated 16 million people had visited his grave. On March 14, 1967, Kennedy's body was moved to a permanent burial plot and memorial at the Cemetery. The funeral was officiated by Father John J. Cavanaugh. It was from this memorial that the graves of both Robert and Ted were modeled.
Kennedy's wife, Jacqueline and their two deceased minor children were buried with him later. His brother, Senator Robert Kennedy, was buried nearby in June 1968. In August 2009, his brother, Senator Edward M. Kennedy, was also buried near his two brothers. JFK's grave is lit with an "Eternal Flame." Kennedy and William Howard Taft are the only two U.S. Presidents buried at Arlington.
source: Wikipedia