d100 - Why Does This Dungeon Remain Un-Plundered?

Inspired by a request from another Referee, here is a century of entries that can be used to explain why a the location attached to a Dungeon or other Site-Based Adventure hasn't been completely looted by others prior to the Players catching wind of it. Some of these might serve additional duties as Rumors, Hooks, or other forms of Gossip when asking around about potential Treasure Sites. I suppose if you’re looking for a “Theme” for a Dungeon, you might be able to glean that sort of thing from a few of these as well.