This is the 2253rd most frequent Swedish word.
vilnius
"Vilnius" is not a Swedish word; it refers to the capital city of Lithuania.
Here 'Vilnius' is used as a proper noun to denote the name of the capital city of Lithuania.
Jag har varit i Vilnius under sommaren.
I have been in Vilnius during the summer.
In this sentence, 'Vilnius' serves as the subject in the nominal phrase, representing the city as an entity.
Vilnius är en plats jag alltid velat besöka.
Vilnius is a place I have always wanted to visit.
Here, 'Vilnius' is used as a location in the prepositional phrase, indicating where the historical buildings exist.