There is a ghost town near sydney called Yerranderie that we visited a few months back that was originally blocked off by the flooding of the Warragamba dam in '59, there was only one road in at the time.
Access was blocked by the dam until fairly recently, the town was bought privately a few years back and some of it has been restored, lots of cool abandoned mines to explore. Its pretty much 4WD only access but we took scenic route with some pretty steep fire trails with river crossings in the range rover, im sure there is an easier way in tho
