The location of the magic tree that Geppetto makes into the magic cabinet in episode 1x20 "The Stranger".
Source: Susan Gittins — Flickr
Source: Chris Fisher — Instagram, 2
Clearing where the rescue team led by Starbuck finally meets up with the rebels led by Anders in episodes #220 & #221 "Lay Down Your Burdens" (part 1 & 2).
Source: Battlestar Galactica Filming Locations