FACT 1: Bilibid Prison in Manila is the world’s largest maximum security prison with 20,000 inmates convicted of violent crimes ranging from murder to rape.

FACT 2: Bilbid Prison is spread out over 1,400 acres and includes dormitories, shops, restaurants, taxis and even a TV station.

FACT 3: In 2011, Manila had 1,200 murders, most of which were gang-related,.

FACT 4: It's the inmates in Bilibid prison that keep track and report on the number of prisoners held inside. Prison officials accept this as the only way to keep a headcount.

FACT 5: There are only 40 guards in Bilibid Prison to watch over the 20,000 prisoners.