Northmead Quarry, now located in Charles Herbert Reserve, was one of Sydney's first bouldering areas. It contains one of the longest single sandstone walls in Sydney and is one of the most accessible crags in Western Sydney. Lots of problems and landings are beautifully flat and grassy.
A bit of cleaning is still needed to bring this classic crag back to its former glory.
The 2001 Sydney Bouldering guide contains more detail on this classic crag.