Some of the world's most notorious criminals have been put to death at San Quentin prison, including 'Night Stalker' serial killer Richard Ramirez.
"The Arena", as inmates call it, is the oldest prison in California and the largest death-row in America where 421 condemned men have been executed by gas, noose or needle since 1893.
Since 1996, executions have been carried out solely by lethal injection; although it is worth noting that there has not been such an event since 2006.
