This is the 8021st most frequent Spanish word.
museos
Museos: Museums.
In this sentence, 'museos' is used as the subject of the sentence, referring to institutions generally.
Los museos son lugares interesantes para aprender sobre historia.
Museums are interesting places to learn about history.
Here, 'museos' is used as the direct object in the sentence, specifying the location of our visits.
Vamos a visitar varios museos durante nuestro viaje.
We are going to visit various museums during our trip.
In this case, 'museos' is part of a propositional phrase, denoting the topic being discussed.