I like Fiction, Action, Adventure, and alternate settings (I guess you might call them "fantasy settings", but not with unicorns, elves, etc. - I mean fantasy settings as in underground caves holding civilizations, transporting into the future, survival after the end of the world, etc.)

If anyone has read James Rollins "Subterranean", "Amazonia", or "Ice Hunt" - that's the kind of stuff I really like.

Also what I mean - A lesser known author, Patrick Lee, writes stuff like this too. I liked his book "The Breach" and I'm currently reading his "Ghost Country" (second in The Breach series), which has grabbed ahold of me tightly, even though I'm less than 1/4 of the way in.

If anyone has read any of these books I've listed above, or understands what I like to read from my description, ... any suggestions? Authors? Specific titles?

Thanks in advance.