[andretti1977]

I find it amazing and really interesting, but i have a "side" question: does anybody know how much does it cost to realize such a great work?

[Andrew_nenakhov]

Approx 20% of gdp of the Achaemenid empire x 200 years.

[truly]

There are around 20 persons credited at the end, so that should give a rough estimate. It is quite well done.

Animation and graphics is quite expensive to develop, since iterations in the development loop can take quite some time (think: do a few changes, render everything, start up the animation, check if it looks right, repeat).