There are caves in Riven??
OMG, it's been so long away that I was playing Riven.

I don't remember of any caves.
Breldur is still good sized. I don't have any technical problems while visiting it. But I'm beginning to be carefull. I don't use any large textures anymore and I try to use alot of textures more than once. That should keep the age playable.
@tachzusamm: Yes, I'm an unallowed brilliant genius (in texturing and modelling)!!
It's not a secret: I spend alot of time in modelling, texturing and lightning of objects.