This is the 9462nd most frequent Polish word.
wawelem
"Wawelem" is the instrumental form of "Wawel," referring to "Wawel," a historic castle hill in Kraków, Poland. It means "with/at Wawel" in this grammatical context.
Here, 'Wawelu' is the locative case of 'Wawel', indicating the location where the action took place.
Widziałem zamek na Wawelu, jest naprawdę imponujący.
I saw the castle on Wawel; it is really impressive.
'Wawelu' in this sentence uses the locative case again, highlighting a place associated with the action.
Wybraliśmy się na spacer po Wawelu, odkrywając jego historię.
We took a walk around Wawel, discovering its history.
In this case, 'Wawelu' appears in the genitive case, showing an association or relation to 'history'.