Sydney Tower is to turn off the lights later this month to offer two Sydney by Moonlight Skywalks.
On 29 March Skywalkers will be provided with torches for their walk as businesses across the Australian city turn off their lights at 8pm as part of Earth Hour.
The event, launched in Sydney in 2007, is now a global effort to encourage locals and businesses to turn off their lights for one hour to show their commitment to reduce global warming.