rubberneck
1. verb To gawk, gape, or stare, especially with a naïve, unsophisticated, or foolish manner. I hate the amount of people who descend on the city each year wander around and rubberneck. People kept clogging up traffic as they slowed down to rubberneck at the accident.
2. noun Someone who gawks or stares in such a manner. The famous cathedral was filled with rubbernecks, much to the chagrin of the regular churchgoers. A bunch of rubbernecks gathered around to watch the building burn.