Wentworth Falls is located in the Blue Mountains National Park, a few kilometres east of the township of Katoomba. The total height of the falls is 187 metres, and the falls consist of several drops.

Canon EOS 50D, 10-22mm @13mm, 6/10 sec, f/9, ISO200
The walking trail down to the middle falls consists of 173 steps cut into the stone, down a 90 metre cliff face. Apparently it is the longest outdoor staircase in Australia!
The stone steps are creatively named the "Grand Stairway", and walking back up the many steps is definitely harder than walking down.
Below are a couple of photos (taken with my phone) showing the Grand Stairway.
Surprised our nanny state hasn't closed off tracks like this ;)
Lovely main shot. The water cascading at the top of the frame almost gives off a slight mystic feel to the shot. Great work Martin.