Piccadilly Circus in London was also left in the dark (WWF/PA)
…and after it switched off its lights (WWF/PA)
The Royal Society for the Conservation of Nature arranged 11,440 candles on a hilltop in the capital of Amman (Raad Adayleh/AP)
The Millennium Monument, a landmark of the Hungarian capital with its illumination switched on prior to the Earth Hour event… (Tamas Kovacs/MTI via AP)
The landmark India Gate monument is seen lit, top, and then in darkness after the lights were turned off for one hour (Oinam Anand/AP)
The globe landmark of the Philippines’s largest shopping mall, the Mall of Asia, turns dark for Earth Hour (Bullit Marquez/AP)