Ingrid Bergman plays the rich woman and Anthony Quinn is the man she had the affair with in this Italian production. It's a very strong brew with lots of intense emotions and broadly played scenes, but it packs a mighty wallop and is worth watching alone for Ms. Bergman's wardrobe, which is spectacular - just look at those glasses! As in many Italian films the dialog is recorded after principal photography is completed, so there's that slightly out of sync quality to the finished product, but it was originally done in English, so it's not dubbed in that sense. This trailer uploaded by Movie Clips Trailer Vault gives you the flavor of the piece.
If this ever comes up on television, be sure and watch or record it. It's really worth seeing for the spectacle and the intense emotions that it brings up. If you're obsessed with seeing it you can sometimes find discs for sale at iOffer.com.
Obscurity factor: 7 (no DVD, no VHS, Infrequently aired on television, well represented on YouTube)