The Caves is an optional two-level dungeon accessible from the Cold Plains in Act I of Diablo II. The first level is a larger cavern populated primarily by Fallen, Corrupted Rogues, and skeletons. Among them is the Super Unique monster Coldcrow.
The second level is smaller and non-randmized (the layout is the same every time). It contains golden chest guarded by numerous monsters (including champions and uniques). Piles of gold can be found in various corners of this level.