As of November 2023, the British Foreign and Commonwealth Office lists 226 different Countries or Territories.
Backpacking the Famagusta Ghost Town in the Turkish Republic of Northern Cyprus, not recognised by anyone, except Turkey, of course:

I like their list better than the UN Member States List because they list Hong Kong, Macau, Taiwan, Kosovo (photo below from Peja in Kosovo, and Western Sahara separately. They also include the Occupied Palestinian Territories, which pleases me.

Checkpoint Charlie, Germany, 2010:

But if they can include Western Sahara and San Marino, why not also include Transnistria (below) or Nagorno-Karabakh?

But weirdly, they don’t list England, Scotland, Wales or Northern Ireland. Hell, they don’t even list The United Kingdom. It exists. I went there. I have a passport from there. And a birth certificate.
So the British Foreign and Commonwealth Office list is no better, no worse than the UN Member State list. Yup, it´s all just politics
Backpacking in The United Kingdom – England:

Visiting Scotland’s Secret Bunker in Fife:

Backpacking the Giant’s Causeway in The United Kingdom – Northern Ireland:

Sorry Wales, I don’t have any selfies.
Drinking a Belikin Stout after backpacking the Cahal Pech Archaeological Reserve in Belize:

Of the 226 Countries and Territories, I have been to 120 of them:
- Albania
- Armenia
- Andorra
- Australia
- Austria
- Azerbaijan
- Belarus
- Belgium
- Belize
- Bosnia and Herzegovina
- Botswana
- Brunei
- Bulgaria
- Burundi
- Cambodia
- Canada
- China
- Costa Rica
- Côte d’Ivoire
- Croatia
- Cyprus
- Czech Republic
- Denmark
- Dominican Republic
- Egypt
- El Salvador
- Estonia
- Ethiopia
- Finland
- France
- The Gambia
- Georgia
- Germany
- Gibraltar
- Greece
- Guatemala
- Guinea
- Guinea-Bissau
- Honduras
- Hong Kong
- Hungary
- Iceland
- India
- Indonesia
- Iraq
- Ireland
- Israel
- Italy
- Jordan
- Kazakhstan
- Kenya
- Kosovo
- Kyrgyzstan
- Laos
- Latvia
- Lebanon
- Lesotho
- Liberia
- Liechtenstein
- Lithuania
- Luxembourg
- Madagascar
- Malawi
- Malaysia
- Mali
- Malta
- Mauritania
- Mexico
- Moldova
- Monaco
- Montenegro
- Morocco
- Mozambique
- Myanmar (Burma)
- Namibia
- Nepal
- Netherlands
- New Zealand
- Nicaragua
- North Macedonia
- Norway
- Pakistan
- The Occupied Palestinian Territories
- Panama
- Philippines
- Poland
- Portugal
- Romania
- Russia
- Rwanda
- San Marino
- Senegal
- Serbia
- Sierra Leone
- Singapore
- Slovakia
- Slovenia
- South Africa
- South Korea
- Spain
- Sri Lanka
- Sudan
- Sweden
- Switzerland
- Syria
- Taiwan
- Tajikistan
- Tanzania
- Thailand
- Tunisia
- Turkey
- USA
- Uganda
- Ukraine
- United Arab Emirates
- Uzbekistan
- Vietnam
- Western Sahara
- Zambia
- Zimbabwe