It was built in 1947 to replace University Gymnasium, which had burned to the ground in 1944.

It houses a 1,500-seat gymnasium, squash courts and a pool.

From 1947 to 1969 it housed the men's basketball team before the building of Jadwin Gymnasium.

[2] As the headquarters of Princeton University's Campus Recreation program, Dillon is also home to the 8,000-square-foot (740 m2) Stephens Fitness Center, a 1,280-square-foot (119 m2) Dance Studio, a 1,250-square-foot (116 m2) Martial Arts Room, and a Spinning Room with 14 bikes.

[3] On 15 February 1964 Bill Bradley scored 51 points here in a basketball game for Princeton University, allowing Princeton to defeat Harvard University, 87-56, before 2,700 fans.