This is the 2823rd most frequent Russian word.
таллинна
"Таллинна" is the genitive case of "Таллин" (Tallinn), meaning "of Tallinn," the capital city of Estonia.
Here, "Таллинн" is used as a proper noun, the name of the capital city of Estonia.
Я собираюсь посетить Таллинн в следующем году.
I plan to visit Tallinn next year.
In this instance, "Таллинна" represents the genitive case, indicating possession or association (e.g., "of Tallinn").
Самые красивые фотографии были сделаны на улицах Таллинна.
The most beautiful photos were taken on the streets of Tallinn.
"Таллинна" again reflects the genitive case, describing the landscapes associated with Tallinn.