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. On 19 August 1987 it was announced that Hess had strangled himself two days earlier with a piece of electrical flex and that he had left a note in old German script. Shortly afterwards the prison was demolished.