I noticed something interesting while marking new runes in Felucca for my Miner(s). I was trying to mark safer runes away from where PK's or other People would venture to do my Miner harm. While exploring I discovered that I could no longer enter some Caves that were obviously there. They seemed to be blocked off from entering them as I kept bouncing back. I went to my Rune Library and found a Runebook entitled "Felucca Caves" and was amazed that the same Caves I could not walk into, I could recall into. I gave one of my Miners this Runebook and used it to recall around. While mining, I noticed that a group of Orcs spawned just outside of the Cave entrance and they wanted to come play with me, but the Cave was not allowing them to enter. In those particular Caves, I finally felt safer -- AT LAST!
Some Caves you can still enter from outside by walking into them, but there are other Caves as described above.