This is the 1844th most frequent Polish word.
europa
Europe.
In this sentence, 'Europa' refers to the geographic region and cultural-historic entity, Europe.
Europa jest kontynentem o bogatej historii.
Europe is a continent with a rich history.
Here, 'Europie' is the locative case of 'Europa', indicating location within Europe.
Podczas podróży po Europie odwiedziłem wiele zabytków.
During my travel across Europe, I visited many landmarks.
In this context, 'Europa' symbolizes the collective identity or political union of European countries.