That front door's locked, so I don't see any other way of getting in. That place doesn't really seem to be of much significance at all so I doubt there's any sort of secrets related to it. It's just like all the invisible barriers in Konquest, that's just one place you can't go.

I always thought that’s the place were you had to return or achieve (don’t remember)something.
Somone tells you to leave that thing in the temple.
What temple is he talking about?
BTW, were can I help Kira to get back her memories?

I think you're talking about Kabal, he tells you to hide a map in the temple ruins. However, that's not the temple he's talking about. The only way I know how to describe the temple he means is that you get to it by way of the portal that Mokap is standing next to.

When you try to enter the temple, it doesn't even say that it's locked. But why have such a large area with no significance?

that's what i am saying....it is such a waste of space, right?
and you're correct it doesn't say anything about it being locked
there is nothing else to do in that location, it just has a transport thing and that's pretty much it
i don't get what the heck is it there for....it's not even mentioned in any mission or anywhere else...weird
it's just there, they could have just put a big wall there or something instead :)