Established in 1893, the campus is located in an environment of neo-Spanish architecture, green lawns, hundred-year-old oak trees, and is nestled against the San Gabriel Mountains.

In 2018, the Marching Wildcats won 1st Place (Gold Medal) at the SCSBOA 1A Championships with their high performance of their show that year “Remix de Lune”.

On October 23, 1946, the high school was the site of the fourth debate between incumbent Congressman Jerry Voorhis and his challenger, future president Richard Nixon.

The varsity football team won the CIF-Southern Section championship in its 10th try, defeating Whittier Christian High of La Habra by a score of 38–8 on December 11, 2010.

The varsity football team won the CIF-Southern Section championship for the third time in a row in 2012, beating Paraclete High School of Lancaster by the score of 23–7 on November 30, 2012, at Monrovia High School, giving head coach Ryan Maddox a third championship in a row.