Countries I have visited:

All the countries in the world

This list was taken from "List of countries by continent (data file)" on Wikipedia.

 Afghanistan, Islamic Republic of
 Åland Islands
 Albania, Republic of
 Algeria, People's Democratic Republic of
 American Samoa
 Andorra, Principality of
 Angola, Republic of
 Anguilla
 Antarctica (the territory South of 60 deg S)
 Antigua and Barbuda
 Argentina, Argentine Republic
 Armenia, Republic of
 Aruba
 Australia, Commonwealth of
 Austria, Republic of
 Azerbaijan, Republic of
 Bahamas, Commonwealth of the
 Bahrain, Kingdom of
 Bangladesh, People's Republic of
 Barbados
 Belarus, Republic of
 Belgium, Kingdom of
 Belize
 Benin, Republic of
 Bermuda
 Bhutan, Kingdom of
 Bolivia, Republic of
 Bosnia and Herzegovina
 Botswana, Republic of
 Bouvet Island (Bouvetoya)
 Brazil, Federative Republic of
 British Indian Ocean Territory (Chagos Archipelago)
 British Virgin Islands
 Brunei Darussalam
 Bulgaria, Republic of
 Burkina Faso
 Burundi, Republic of
 Cambodia, Kingdom of
 Cameroon, Republic of
 Canada
 Cape Verde, Republic of
 Cayman Islands
 Central African Republic
 Chad, Republic of
 Chile, Republic of
 China, People's Republic of
 Christmas Island
 Cocos (Keeling) Islands
 Colombia, Republic of
 Comoros, Union of the
 Congo, Democratic Republic of the
 Congo, Republic of the
 Cook Islands
 Costa Rica, Republic of
 Cote d'Ivoire, Republic of
 Croatia, Republic of
 Cuba, Republic of
 Cyprus, Republic of
 Czech Republic
 Denmark, Kingdom of
 Djibouti, Republic of
 Dominica, Commonwealth of
 Dominican Republic
 Ecuador, Republic of
 Egypt, Arab Republic of
 El Salvador, Republic of
 Equatorial Guinea, Republic of
 Eritrea, State of
 Estonia, Republic of
 Ethiopia, Federal Democratic Republic of
 Faroe Islands
 Falkland Islands (Malvinas)
 Fiji, Republic of the Fiji Islands
 Finland, Republic of
 France, French Republic
 French Guiana
 French Polynesia
 French Southern Territories
 Gabon, Gabonese Republic
 Gambia, Republic of the
 Georgia
 Germany, Federal Republic of
 Ghana, Republic of
 Gibraltar
 Greece, Hellenic Republic
 Greenland
 Grenada
 Guadeloupe
 Guam
 Guatemala, Republic of
 Guernsey, Bailiwick of
 Guinea, Republic of
 Guinea-Bissau, Republic of
 Guyana, Co-operative Republic of
 Haiti, Republic of
 Heard Island and McDonald Islands
 Holy See (Vatican City State)
 Honduras, Republic of
 Hong Kong, Special Administrative Region of China
 Hungary, Republic of
 Iceland, Republic of
 India, Republic of
 Indonesia, Republic of
 Iran, Islamic Republic of
 Iraq, Republic of
 Ireland
 Isle of Man
 Israel, State of
 Italy, Italian Republic
 Jamaica
 Japan
 Jersey, Bailiwick of
 Jordan, Hashemite Kingdom of
 Kazakhstan, Republic of
 Kenya, Republic of
 Kiribati, Republic of
 Korea, Democratic People's Republic of
 Korea, Republic of
 Kuwait, State of
 Kyrgyz Republic
 Lao People's Democratic Republic
 Latvia, Republic of
 Lebanon, Lebanese Republic
 Lesotho, Kingdom of
 Liberia, Republic of
 Libyan Arab Jamahiriya
 Liechtenstein, Principality of
 Lithuania, Republic of
 Luxembourg, Grand Duchy of
 Macao, Special Administrative Region of China
 Macedonia, the former Yugoslav Republic of
 Madagascar, Republic of
 Malawi, Republic of
 Malaysia
 Maldives, Republic of
 Mali, Republic of
 Malta, Republic of
 Marshall Islands, Republic of the
 Martinique
 Mauritania, Islamic Republic of
 Mauritius, Republic of
 Mayotte
 Mexico, United Mexican States
 Micronesia, Federated States of
 Moldova, Republic of
 Monaco, Principality of
 Mongolia
 Montenegro, Republic of
 Montserrat
 Morocco, Kingdom of
 Mozambique, Republic of
 Myanmar, Union of
 Namibia, Republic of
 Nauru, Republic of
 Nepal, State of
 Netherlands Antilles
 Netherlands, Kingdom of the
 New Caledonia
 New Zealand
 Nicaragua, Republic of
 Niger, Republic of
 Nigeria, Federal Republic of
 Niue
 Norfolk Island
 Northern Mariana Islands, Commonwealth of the
 Norway, Kingdom of
 Oman, Sultanate of
 Pakistan, Islamic Republic of
 Palau, Republic of
 Palestinian Territory, Occupied
 Panama, Republic of
 Papua New Guinea, Independent State of
 Paraguay, Republic of
 Peru, Republic of
 Philippines, Republic of the
 Pitcairn Islands
 Poland, Republic of
 Portugal, Portuguese Republic
 Puerto Rico, Commonwealth of
 Qatar, State of
 Reunion
 Romania
 Russian Federation
 Rwanda, Republic of
 Saint Barthelemy
 Saint Helena
 Saint Kitts and Nevis, Federation of
 Saint Lucia
 Saint Martin
 Saint Pierre and Miquelon
 Saint Vincent and the Grenadines
 Samoa, Independent State of
 San Marino, Republic of
 Sao Tome and Principe, Democratic Republic of
 Saudi Arabia, Kingdom of
 Senegal, Republic of
 Serbia, Republic of
 Seychelles, Republic of
 Sierra Leone, Republic of
 Singapore, Republic of
 Slovakia (Slovak Republic)
 Slovenia, Republic of
 Solomon Islands
 Somalia, Somali Republic
 South Africa, Republic of
 South Georgia and the South Sandwich Islands
 Spain, Kingdom of
 Sri Lanka, Democratic Socialist Republic of
 Sudan, Republic of
 Suriname, Republic of
 Svalbard & Jan Mayen Islands
 Swaziland, Kingdom of
 Sweden, Kingdom of
 Switzerland, Swiss Confederation
 Syrian Arab Republic
 Taiwan
 Tajikistan, Republic of
 Tanzania, United Republic of
 Thailand, Kingdom of
 Timor-Leste, Democratic Republic of
 Togo, Togolese Republic
 Tokelau
 Tonga, Kingdom of
 Trinidad and Tobago, Republic of
 Tunisia, Tunisian Republic
 Turkey, Republic of
 Turkmenistan
 Turks and Caicos Islands
 Tuvalu
 Uganda, Republic of
 Ukraine
 United Arab Emirates
 United Kingdom of Great Britain & Northern Ireland
 United States of America
 United States Minor Outlying Islands
 United States Virgin Islands
 Uruguay, Eastern Republic of
 Uzbekistan, Republic of
 Vanuatu, Republic of
 Venezuela, Bolivarian Republic of
 Vietnam, Socialist Republic of
 Wallis and Futuna
 Western Sahara
 Yemen
 Zambia, Republic of
 Zimbabwe, Republic of

Goal: visit the rest of the planet.