What's your favorite kind of dungeon?

What's your favorite kind of dungeon? Do you like instances so common in the World of Warcraft where it's just you and a few trusted friends alone against the millions of slavering enemies? Or are you the social type who prefers the EverQuest-style open dungeons where people come as much to chat and show off their latest gear as to kill the minions of darkness? Perhaps a combination — a dungeon with a open portion that leads to instances as in EverQuest 2's Old Sebilis? Or heck, maybe a weird combination of all of the above. Relmstein takes a look through the history of dungeons in MMOs and how, over the years, the dungeon experience has been extended to take into account the many ways people play their games.