Puzzling Pictures 7: This Little Gem

"It's a blink and you miss it place but if you look hard enough you'll find this little gem..." So begins one review of this edifice, on TripAdvisor. I wonder whether anyone can identify it from this view of the entrance, taken from inside?

No, a little bit too difficult? Fair enough. Would it be of any help if I said that it was in Rhos-on-Sea?

Still in the dark, as are most of its visitors, it would seem? Here's a view from the outside, then. Got it? I'm sure some readers will have recognised it by now.

For everyone else: to be continued.