Stella posted a challage: 

The code is 75238712287185399 And she saying the civilizations used them as their building blocks.

the trick is to divide this long number to blocks and map them to somthing. which some one figuer it out to map the number to atomic number in periodic table. 

The break down will be like this: 75   23   8   71   22   8   7   18   53   99   After maping each number to the periodic table and get the name of the matter that correspond to each number we get : Re  V  O  Lu  Ti  O   N  Ar   I  Es

Then the code we got we put at the end of the Url: Stl.la

Like this: Stl.la/Revolutionaries 

Then we will get a link take us to this image :