There is no answer to that.The world is so diverse that it hide many mysteries.Even if we find answers to a lot of them we cannot really be sure how many mysteries are still there to be solved.
Unexplained Mysteries - 2003 The Unreal World was released on: USA: 7 November 2003
Unexplained Mysteries ended on 2004-05-29.
Unexplained Mysteries was created on 2003-09-20.
The Unexplained - 1996 Mysteries of Egypt was released on: USA: 5 June 2000
Ultimate 10 - 1999 Unexplained Mysteries was released on: USA: 1999
Unexplained Mysteries - 2003 This Strange Planet was released on: USA: 10 October 2003
Unexplained Mysteries - 2003 Bizarre Beliefs was released on: USA: 21 November 2003
Unexplained Mysteries - 2003 Undercover UFO was released on: USA: 16 January 2004
Unexplained Mysteries - 2003 Touched by an Alien was released on: USA: 7 May 2004
Unexplained Mysteries - 2003 The Truth About Signs was released on: USA: 24 October 2003
The Universe - 2007 Unexplained Mysteries 2-11 is rated/received certificates of: Australia:G
Unexplained Mysteries - 2003 Dead and Back Again was released on: USA: 28 May 2004