They don't work. Probably you mean this: The most amazing building known.
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JumanahWhen I say "The most amazing known building"It's grammatically incorrect?!It is not actually grammatically incorrect, but it does not seem very likely. You are saying that, of all "known buildings", this is the "most amazing". However, the concept of the set of "known buildings" is a bit strange. It sounds as if some buildings are yet to be disc
JumanahIs this correct?He's the most amazing well-known person.Do you mean that of all "well-known people", he is the "most amazing", i.e. more amazing than any other? Or does "most amazing" mean "very amazing"?