Hundreds of millions of people across the globe will turn off their lights for 60 minutes on Saturday night starting at 8:30pm local time in a symbolic show of support for “Earth Hour” campaign against climate change.

Many of the world’s most iconic attractions, including Sydney Opera House, the Empire State Building and the Eiffel Tower will take part.

Last year more than 150 countries participated in the event which saw some of the world’s most iconic landmarks dim, and this year the movement has spread to Palestine, Tunisia, Suriname and Rwanda.

Newcomers to be plunged into darkness include Copenhagen’s Little Mermaid, the statue of David in Florence and Cape Town’s Table Mountain.

Photo Credit: The Manhattan skyline during the Earth Hour, as seen from across the East River. Citigroup Building, center, was darkened for the duration. ecksunderscore / Flickr