Our Weird Planet

I would like to know more about the unexplained mysteries of our own Gaia. In particular:

1. Mel's Hole: Who created it, where does it go, who and what is at the bottom (if there is one), and what's the deal with the burning ice?
2. Skinwalker Ranch: What is the dome shaped object buried in the mesa? (Is the History Channel program CIA disinformation? Lots of NASA folks appear which makes me suspicious.)
3. Lemuria: The I Am Discourses mentions Guy Ballard being led to a secret entryway under Mt. Shasta, CA, to the yet extant underground civilization of Lemuria. It is also mentioned that there are six or so other such secret entrances around the globe. a) What exactly is under Mt. Shasta?  b) Who are the Lemurians and which side are they on? c) Are they down there rubbing elbows with the reptilians?
4. Phoenix AZ: I have heard tell of a cosmic city hovering above Phoenix. What is that all about?
5. Gravity: Where does gravity come from? Science still has no explanation. The Urantia Book suggests it is generated and controlled by The Universal Father with an explanation which sounds a lot like the Hermetic Principles.