This is the 837th most frequent Hungarian word.
múzeum
Museum.
Here, 'múzeum' is used in its locative form 'múzeumba', which indicates the direction 'to the museum'.
Tegnap ellátogattunk a múzeumba.
Yesterday we visited the museum.
In this sentence, 'múzeum' is used in its nominative singular form, representing the subject of the sentence.
A múzeum történelmi kiállítása nagyon érdekes.
The museum's historical exhibition is very interesting.
Here, 'múzeum' is in its locative form, 'múzeum', denoting the place where something occurs, specifically 'in the museum'.