Movie with a very strange title for it

I can't really give out that much details because I just found out while spamming keys in google while I was younger. (I was bored) I spammed keys until I found a movie that had what I spammed. I only remember seeing two things of it. First one is the poster of the movie poster which had some kind of wormhole with two childrens next to each other. And the last thing was a picture of the ending (probably) with a mountain and 1 or 2 suns in the frame. I am guessing that the plot was about the two kids traveling around dimensions. This might be really hard to find since this was just a faded memory. I already have some movies crossed out in the comments which I might write.