Heartbreak Hill is an ascent over 0.4-mile (600 m) between the 20 and 21-mile (32 and 34 km) marks, near Boston College.
"Tarzan" Brown had taken off so fast at the start of the 1936 Boston Marathon that the press followed the second runner, John A. Kelley, until the 20-mile mark, and it was on this hill that Kelley caught up to Tarzan.