Which Shadowrun adventures and campaigns are generally considered noteworthy, in that they're respective classics, really defined or redefined the setting, or widely considered great or brilliant for some other reason?
When I ask this question about, for example, Warhammer FRP, the unavoidable answer is The Enemy Within, which defined and fleshed out a lot of the setting and the genre, Shadows over Bogenhafen which set the tone and theme for a lot of later adventures, perhaps Death on the Reik for its sprawling, open-ended structure visiting (and thereby defining) a lot of the countryside, and Power Behind the Throne for being this crazy complex ultimate social intrigue adventure. For Earthdawn, I believe the Prelude to War campaign is considered a quality campaign dealing with important events defining the tensions in the setting (its sequel was considered less good; I'm totally unaware of anything beyond that).
For Shadowrun, I suspect there have been a lot more adventures than for WFRP or Earthdawn, but I'm totally unfamiliar with most of them. Do any of them stand out? Did any truly define what Shadowrun was really about? Which ones have, over the years, been considered the most important, most popular, best, most defining or otherwise outstanding adventures and campaigns?
I'm not looking for a single answer, a specific "winner", or for a discussion on the relative merits of one versus another, but for a reference to all adventures and campaigns that are worth checking out for any new Shadowrun GM looking into classic stuff. There are no doubt many adventures and campaigns that stand out for one reason or another, that had an impact on the players, the fans, the community, but I wasn't around at the time and missed out. I'm interested in on overview of all adventures and campaigns that have made a mark on Shadowrun history.