Bridge Stores is a small dungeon that can be found in Rakkis Crossing in Act III of Diablo III.
It can roll an unmarked event: a dying Guard of the Keep crawling out of the opened doors, only to be surrounded by Demonic Hellflyers. In the stores itself, players will find an elite monster pack.
If that event is not rolled, a vendor (Vidar the Collector) will spawn in the stores, and the doors will be closed.