Behind Bars: The World's Toughest Prisons

Sofia Central Prison, Sofia, Bulgaria (1x4)

Air date: May 16, 2016

With a crumbling foundation more than fit for demolition, the conditions in Sofia Central prison is inhospitable for anyone, including criminals. However, with multiple prisoner cells, bunks stacked 3 stories high and horrid isolation cells, prisoners live idly behind bars for 23 hours a day.