Change quest to anything after leoric, then teleport to the graveyard where you went into crypts to get his crown.
There are always 3 crypts there (sometimes 4 - read below), and rarely a treasure goblin / champ pack outside.
Each of those 3 crypts contains at least 2, usually 3 champions/elites, and sometimes a chest. You are also guaranteed at least 1 event per login, which gives decent exp and items.
There is also a chance for one of the crypts to become a Developer Hell (which is an easter egg dungeon), which will contain hard monsters all having names of the D3 developers - there is also an achievement IIRC for clearing it.
My friend and me have been using it to farm hell easily. Lots of champs, easy exploring, fast reload.