This is the 887th most frequent Czech word.
známých
"Známých" means "of acquaintances" or "of friends" in English.
In this sentence, 'známých' is an adjective in genitive plural form describing the landmarks, meaning 'famous'.
Fotografie známých památek vždy přitahují turisty.
Photographs of famous landmarks always attract tourists.
Here, 'známých' serves as an adjective in the genitive plural form for 'famous' or 'well-known', describing the scientists.
Při výzkumu jsme se odkazovali na práce známých vědců.
During the research, we referred to the works of well-known scientists.
Here, 'známých' is used in the genitive plural form of 'známý' to talk about acquaintances or friends in general.