Aberdeen City Council is planning to take a stand against global warming by switching off floodlighting.
The council will switch off the lighting on a number of the city's most high profile landmarks to save energy.
Marischal College, the Wallace monument, St Mark's Church and the St Nicholas Kirkyard facade will remain unlit.
The lights will be turned off between 28 and 31 March as part of the world wide initiative known as Earth Hour.
Other cities due to participate include Chicago, Melbourne, Brisbane, Tel Aviv and Toronto.
The council said it was a safe option for the public, as the regular street lights will stay on.
Councillor Ron Clark, lead councillor for environment, said: "Switching off the lights over a whole weekend on the four landmarks is the way we wish to show our commitment to reducing global warming.
"We will also urge our employees to ensure all electrical equipment and unnecessary lights are switched off for the weekend when leaving council offices on Friday."