Only 25 countries that Ive spent nights in: Argentina, Austria, Bolivia, Canada (3 provinces), Chile, Colombia, Costa Rica, Croatia, Cuba, Ecuador, France, Germany, Greece, Hong Kong, Italy, Mexico, Netherlands, New Zealand, Peru, Portugal, Singapore, Spain, Switzerland, United Kingdom (Engalnd only), United States of America (22 States: Arizona, California, Colorado, Connecicut, Florida, Hawaii, Indinana, Illinois, Lousiana, Maryland, Massachusetts, Nevada, New Hampshire, New Jersey, New York, Ohio, Pennsylvania, Rhode Island, Texas, Vermont, Virginia, Washington + DC)
Plus 7 more where I only visited on day trip - Belgium, Bosnia, Liechtenstein, Macau, Monaco, Paraguay,Vatican City
As far as Australia goes have spent many nights in NSW, Vic, Qld, SA, NT, WA, Tas amd ACT, but not yet been to Norfolk or Christams islands.
Had my trip not be cancelled by Corona Virus I would have added 8 more countries with night stays: UAE, Denmark, Norway, Sweden, Finaland, Estonia, Latvia, Lithuania + plus an airport visit to Qatar, hopefully will be next year now.