center of attraction
A person, place, or thing that attracts the most attention among others. There were many movie stars at the premiere, but the leading lady was the center of attraction. Temple Bar is definitely the center of attraction in Dublin.
fatal attraction
1. In a romantic relationship, an attraction to the very qualities in a person that ultimately lead to the relationship falling apart. John had a fatal attraction to the wild, uninhibited life Cynthia led, but she cared more about "living free" than having a functional relationship. I was completely enamored by his self-confidence and charm, but it was just a fatal attraction to a man who turned out to be a complete narcissist.
2. An intense and obsessive infatuation with another person, especially by a spurned lover, that might lead to harassment or violence. A: "I broke up with Chris over two months ago, but he's still constantly checking in on me and even started threatening this new guy I started seeing." B: "Whoa, talk about a fatal attraction."