Passion

Does this tragic romance series not have enough tragic romance for you? You're in for a treat!

Luce hops back through time with her plucky gargoyle sidekick, observing so many tragic deaths that I lost count. It is actual time travel, rather than observing memories, but she's fairly careful about disturbing continuity and the rules are pretty flexible. If something changes, that's how it's always been. I didn't find it as frustrating as some time travel stories (granted my standards are already low for this series.)

The variety of ways Luce and Daniel are cast in different settings (not just European and North American!) is interesting, though some variations on their names are cringe worthy.