The story of Orpheus and Eurydice keeps haunting me. It's so beautiful and tragic at the same time. Orpheus travels to the under world to get Eurydice back and he can succeed; one condition;  he can't look back to see if Eurydice is with him until they've reached the real world - but Orpheus looks back when he has passed the gates only to watch Eurydice fade away into the arms of Death  because she hadn't passed the gates yet - they got reunited when Orpheus was killed.