Meaning of “sightseeing” - Learner’s Dictionary

sightseeing

noun [ U ] uk us /ˈsaɪtsiːɪŋ/

A2 the activity of visiting places that are interesting because they are historical, famous, etc:

a sightseeing tour of London
sightseer uk us /ˈsaɪtˌsiːər/ noun [ C ]

a person who goes sightseeing

(Definition of “sightseeing” from the Cambridge Learner’s Dictionary © Cambridge University Press)