The Alfred P. Murrah Federal Building was a United States Government office building located in Oklahoma City, Oklahoma. On the morning of April 19, 1995 it was the target of a massive bombing which sheared off the entire north side of the building, killing 168 people. This was the most significant act of domestic terrorism on American soil prior to the September 11, 2001 attack on New York City. The memorial was dedicated on April 19, 2000, the fifth anniversary of the bombing. Read about is on Wikipedia.