Druid lvl 6 Divination.
Duration 1 min./level
You gain the ability to speak with stones, which relate to you who or what has touched them as well as revealing what is covered or concealed behind or under them. The stones relate complete descriptions if asked. A stone's perspective, perception, and knowledge may prevent the stone from providing the details you are looking for. You can speak with natural or worked stone.
So is this spell tremendously useless because each individual stone in a castle would have a very limited perception, I suppose a player could ask the entire room if there is a hidden door. SO not too bad so far, not epic for a lvl 6 spell.
The real question is this: A mountain range is a single "Stone", so does that mean a lvl 6 druid spell lets a druid know every aspect of an entire mountain range? And if a mountain range is one "stone" with a CONTINENT...
Well, this is suddenly a potentially amazing spell right? Or would a continent (or mountain) simply not apply to the spell?
I ask because this almost came up in one of my games, a player wanted to know the entire natural cave network of a mountain and all of the invisible creatures they were fighting at the time. The 10 minute casting time prevented its use, after, the player and I agreed that any future use was simply too ambiguously worded to be used practically by us without some kind of community support one way or the other.
It just says "a stone", it's up to you, the GM, to define what you think "one stone" is. There are arguments for and against it, modifiers such as natural breaks/fault lines/alternate types of rock (stone, grantie, marble, etc..). It's up to you to decide how much is too much.
It's very much in GM territory, and probably depends on how much your GM wants you to know. I used it in a high-level module with a stone oracle, and my GM allowed the stones to talk to each other to relay some information, and as a vector for getting some of the backstory we might not have seen. We also used it to get through a maze near the end, but that was mostly because it had been taking a long time to get through everything and the GM let it happen.
You could ask your GM how useful he would allow it to be. Luckily druids can just swap it out the next day if it doesn't work, or even turn it into a summon spell.