a. the language (elvish, ect)
b. the cities (Minas Tirith, Gondolin, Menegroth)
c. the people (Aragorn, Legalos, Galadriel)
d. the weapons (Glamdring, Narsil, ect)
e. the geography (the forests, plains, islands, mountains, caves)
f. other
For me definitely the languages
The cities (especially Gondolin 😊 ) are also really cool, but I doubt they would be as cool if they were real
The people? Uh, no, thank you. They would be totally lost here
Weapons would be great (especially Gurthang 😂 ), too, but sword is sword and we already have cool weapons like japanese Katanas and stuff.
The geography is amazing,
But fact is that it's pretty similar to ours... except that the Endorian geography isnt as anthropophied and destroyed as ours yet, no dirty rivers etc
And the languages are simply superior to everything we have, in elegance, beauty, logic, liveliness and flow.