This concept comes up very specifically in the Order of Bards, Ovates and Druids as part of the Ovate Grade training. As with many things in OBOD, the usages and interpretation aren't set in stone (pun intended) but it does serve a very specific purpose during the Ovate Grade. I won't get into that in detail out of respect for the mystery tradition but I'll say a few words about how my journey with this concept went.
Since I moved to where I now live, one of the places I discovered in exploring in the wild areas was a place I call Great Rock. It's a huge granite boulder, likely brought to the area from ancient glaciers, and for those that are sensitive to such things the place is a... well, it gets called different things depending on your tradition. Ley lines, dragon lines, energy nexus, whatever. Whenever I really, really need to ground... that's the place I go. You can sit upon Great Rock, and the energy will pull you downwards, doing pretty much what you mention in the opening post - stability, here-and-nowness, simply being.
If you are fortunate and have a long developed relationships with the Spirits of Place at an energy nexus like that, it may grant you a very special gift. In my view, you should never, ever take from a site like this. Only ever if it is a gift. If you practice an esoteric mystery tradition of some sort, you'll develop the skills to know to read the signs and feel the energies of the land. And one day when visiting Great Rock, it had a gift for me - a piece of that Great Rock. I resisted hard at first because it... well... I knew how big of a deal it was. The energy of the place or less shoved hard back against my denial of the gift. I was humbled, and accepted. A piece of Great Rock sits in my altar room, as an Anchor Stone. When I sit with it, it connects me powerfully to the energy of that place and has more or less the same effect as actually being there. It takes you deep, down, here, now.
There will probably come a day when I return the stone to where it came from, but only if I get the sense it feels right to do so. Or pass it on to someone else who would understand its importance and energy and significance. The depth of its significance comes from a relationship I've built up over a decade with that place and those lands. It is not something that happens quickly.
