Shame
From UO-Phoenix Wikipedia
Shame is a dungeon found just west of the Blighted Grove. It is one of the oldest dungeons in the game, one of the so-called Anti-Virtue Dungeons, or Dungeons of Sin. It is commonly considered a great starting place for newer players or characters, particularly its first level.
Unlike other dungeons, one descends or ascends through black moongates instead of stairs or ramps. It has a total of 5 levels. Monster difficulty roughly increases each level.