Superlative
Adjective or Noun: A form that denotes the best.
Examples: “The world’s oldest human made canal.” “The Tri-State area’ s largest bowling alley”
The mausoleum in the photo is in Trento, Italy. I never tried tp understand what the monument signified. It was mostly deserted when I was there. Here is a link. I now know how to find out more about how it came to be, but i haven’t yet.
I have written about superlatives before here is another link. I had never though about the specific meaning it is complicated but I know one when I see one.