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The high-profile American prison camp in Cuba used to house what the U.S. government considers to be some of the world’s most dangerous terrorists also happens to be the world’s most expensive prison, as Reuters reports:

The Pentagon estimates it spends about $150 million each year to operate the prison and military court system at the U.S. Naval Base in Cuba, which was set up 11 years ago to house foreign terrorism suspects. With 166 inmates currently in custody, that amounts to an annual cost of $903,614 per prisoner.

By comparison, super-maximum security prisons in the United States spend about $60,000 to $70,000 at most to house their inmates, analysts say. And the average cost across all federal prisons is about $30,000, they say.