Current Count: 26
I have already visited the countries in bold as of September 13, 2017.
Bosnia and Herzegovina
Holy See (Vatican City)
Republic of Moldova
The former Yugoslav Republic of Macedonia
United Kingdom of Great Britain and Northern Ireland
I realize that the number of European countries is debatable. The first 48 in the name does not refer to ALL the European countries. Instead it simply means that I intend to go to 48 different European countries in as many months. For my own personal purposes, the above countries would each count toward my 48. This list is not meant to make any political statements or diminish the importance of different areas to the European community.
Source: United Nations, Wikipedia