If you search about Brussels, you will see that some claim it is the most boring capital in Europe while some other describe it as exciting.
This is something peculiar. Actually, there are two capital cities in the world that are below the sea level, and both are located in Europe, who would say?
When this is about the westernmost capital city in Europe, one can speak about the mainland or in general, this is about different cities.
When this is about the capital cities that are farthest from the equator, one could think about the north side and the south side of the globe. But it turns out that this is only about the capitals in the north.
The term the coldest may imply the average temperature throughout the year or the lowest temperature in a particular winter month. In any case, the answer is below.
If you are thinking of moving to the south and reducing your heating and living expenses, you will want to check this list of the warmest capitals in Europe.
There are two southern island nations with their capitals that politically belong to Europe, but one could place them geographically in Africa and Middle East (Asia).
When this is about the oldest cities in Europe, out of top 8, only one of them is not in the present day Greece, but all 8 of them are the cities of the old Greece.
The question in the title is a real question asked by people, but it is actually misleading. The story about the EU capital is a bit more complicated.
If you take the question “What is the most boring big capital city in Europe?” and use it on Google, you will see that there are several forums and other sites, all pointing out to the same city.