Answer: When we visited New York City, we saw many famous historic places.
Objects of prepositions are the elements preceded by a preposition which add the necessary information to complete them.
<em>New factories used machines and electricity in place of </em><em>horses</em><em>.</em>
Explanation: in this sentence, there is only one preposition (in place of) and its object cannot be other than what follows it (horses). In general, objects of prepositions are nouns.
