sightseeing
n.the activity of visiting famous or interesting places while you are on holiday. You usually do this to see monuments, museums, or beautiful views.
n.the activity of visiting places of interest in a particular location, typically for pleasure or cultural education.
“We spent the whole day sightseeing in the city center.”
“After a morning of sightseeing at the cathedral, we stopped for lunch at a local bistro.”
“The tour package balances structured sightseeing at historical landmarks with ample free time for travelers to explore the local markets independently.”
Often used as a gerund noun; frequently pairs with the verb 'go' ('go sightseeing').
Sightseeing is uncountable and does not have a plural form.
From sight + seeing.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.