This is a bit of a long shot but....
Outlander EP 14 the search. Clare searching through highlands searching for Jamie. She is dressed in men's clothes and singing a lewd song , billed as the Sassenach. A gypsey givers her a message to head for Glen Rowan Cross ASAp.
We see her running up a red sandstone ramp carved into a natural overhang, it leads to a cave and some tunnels/rooms. Does anyone happen to know where this is - I can't find it and I've been googling for hours 