I found the other three pictures but I can't find the first one. The riddle is 

We built a monument to it with two hands

But it still escapes our grasp

We all want more and can never have enough

Eventually we will all run out 

It's not the exact words for it, but it's pretty much the same. Does anyone know where this is referring to?

You can find the solution for riddles in the wiki: https://renryuu.miraheze.org/wiki/Riddles#The_Girl_and_her_Pictures