The Blue Mountains are a range of mountains and deep valleys two hours west of Sydney. They are covered in eucalypt forest and the gum trees emit a blue haze which give the mountains their name. The high escarpments drop vertically into the valleys and there are numerous waterfalls with drops of up to a thousand feet.
We stayed in an "eco-lodge" set deep in the forest near the town of Blackheath. Our lodge was pretty luxurious but was designed to have minimum impact on the surrounding bush so it has such non-standard features as a composting toilet, solar driven battery power and log burning stoves. None of them a problem - but it takes a bit of getting used to.
The weather is often bad in the Blue Mountains - four years ago we spent two days there in total fog and never saw a thing - but this time we got dry and sunny weather which was a relief.