A sea of pilgrims packed St. Peter's Square in Vatican City today to be a part of history.

They came to listen to Pope Benedict the 16th deliver his final public speech.

Tomorrow, the 85-year-old Pontiff will officially resign, making him the first Pope to do so in nearly 600 years.  In addressing the massive crowd today, the Pope said although he'll no longer be the leader of the world's one-point-two billion Roman Catholics, he is "not abandoning the cause."