• Italy
    10 April 1964
    (Rome)
  • Italy
    17 May 1964
    (Turin)
  • Austria
    5 June 1964
  • Italy
    24 June 1964
    (Milan)
  • Japan
    18 July 1964
  • West Germany
    27 November 1964
  • France
    30 December 1964
  • USA
    7 April 1965
  • Uruguay
    20 September 1965
  • UK
    9 January 1966
  • Spain
    7 February 1966
    (Madrid)
  • Mexico
    6 October 1966
  • Finland
    19 July 1968
  • Sweden
    14 February 1972
  • Denmark
    5 October 1973
  • Finland
    23 October 2009
    (Iik!! Horror Film Festival)
  • Finland
    7 November 2009
    (Cinemare Film Festival)
  • Greece
    14 November 2013
    (Panorama of European Cinema)
  • USA
    21 April 2015
    (Blu-ray premiere)
  • France
    3 July 2019
    (re-release) (restored version)
  • France
    15 September 2019
    (Strasbourg European Fantastic Film Festival)