1
general::
View noteworthy features or objects, especially when visiting a place. For example, It's impossible to see all the sights of Paris in just a week. [Mid-1700s]
American Heritage Idioms
2
general::
Phrase(s): see the sights
to see the important things in a place; to see what tourists usually see. • We plan to visit Paris and see the sights. • Everyone left the hotel early in the morning to see the sights.
McGrawhill's American Idioms And Phrasal Verbs