I don't want to spoil all the puzzles, what does it gave?

Hello Lailai!
The removal of Vines and the uncovering of the ancient floor (with level 3 of engineering)
Highlight above for spoiler

Just a note Laurence, I noticed you've done this in a few of your posts, that's not invisible text. You can see it a bit. It's pretty hard to see, but if you want completely invisible, use the color on the top that's fifth from the left. It's called [color:#FFFFCC] just saying, it's okay though.

It's deliberately! I want that we can see there is something!

Oh, OK, that's fine.

when you get lvl 3 culture and lvl 3 construction youn can start uncovering ancient ruins[/color]