The Junkyard

Complete the hard path in the Alley to unlock the Junkyard, the alternate Act 1 branch. The Junkyard is tougher than the Sewers path and features different enemies and loot. It leads to the Boneyard. Both the Caves and Boneyard must be cleared to progress to Act 2, so you will need to tackle both branches eventually regardless of which one you start with.