Most expensive prison per inmate

The most expensive prison, in terms of cost per inmate, was Spandau Prison, in Berlin, Germany, originally built in 1887 for 600 prisoners, was used solely for the Nazi war criminal Rudolf Hess (1894–1987) for the last twenty years of his life. The cost of maintenance of the staff of 105—from the four occupying powers, namely France, the United Kingdom, the USA and the USSR—was estimated in 1976 to be $415,000 (£;230,000) per annum.