"Castle of Glass" is a song written by American rock band Linkin Park for their fifth studio album, Living Things. The song was produced by co-lead vocalist Mike Shinoda and Rick Rubin. The song was released as a promotional single for Danger Close Games's 2012 release, Medal of Honor: Warfighter, as with Linkin Park's previous contribution to the Medal of Honor series, "The Catalyst". The single was released on February 2, 2013, in physical format and on March 22, 2013, it was released as a digital single on iTunes.