The LEGO Ninjago Museum

Is not an artefact but the Ninjago museum basement is filled with lots of old artefacts , like for example the Helmet of Shadows (with which you can control the Stone Samurai), a statue of Morro (because he turned back into a statue on the day of department), a few old ninja suits and Samurai X armours (I think that the ninja have sponsored them), two guardian statues (don't ask me where they come from), the Sword of Sanctuary (the legendary blade in which you can see your enemy's next move) and a few boxes (here is the perfect place for LEGO to bring a few more Easter eggs in).

In the entrance hall you can present the Golden Legacy Ninjas, which fit perfectly into the given shapes.

From the first floor you have a wonderful view into the entrance hall and there are also a few diamonds up here.

I know the lion and dragon statues are missing and the trees too but I have installed almost 2998/3000 stones.

That’s why I didn't put any minifigures in. (preferrable Doktor Sander Saunders)