This is the 8848th most frequent Russian word.
праге
"Праге" is not a standalone word in Russian; it likely refers to "Праге" (in Prague) in the prepositional case.
In this sentence, 'Праге' is used as the locative form of the noun 'Прага', indicating the location.
Я жил в Праге последние пять лет.
I lived in Prague for the last five years.
Here, 'Праге' is again the locative form, used to specify where the monuments are gathered.
В Праге собраны уникальные архитектурные памятники.
In Prague, unique architectural monuments are gathered.
'Праге' maintains its locative usage, contextualizing the location of the collection.