It's part of Earth Hour, an event that encourages participation in fighting climate change.
[Ads /]
The World Wildlife Fund says Earth Hour is not a one-hour commitment to conservation but rather a symbol of something bigger.
"Participation in Earth Hour symbolizes a commitment to change beyond the hour," the website reads.
[Ads /]
The initiative is supported by 7,000 cities around the world. Landmarks will go dark, and millions of people are expected to turn off their lights.
Earth Hour takes place at 8:30 p.m. - 9:30 p.m. local time.