Area 51 during day time.
A mysterious giant obsidian tower, Area 51 was Spunkiethefirst's greatest mob grinders, and is generally accepted as being one of the wonders of the world.
Spunkiethefirst would often afk for days in the grinder, giving him massive amounts of mob drops, increasing his fortune so much that he had set up charity chests outside, to give undesired mob drops away to anybody who happened to walk by.
Area 51 was located near Cathedral City, in the world we call The Artifact.