Earth Hour 2025 at st Peter Dome in Vatican City by Marco Iacobucci / SOPA Images
The lights of the dome of St. Peter's Basilica will be turned off for an hour on Earth Hour, which falls on March 22.
March 22, from 8:30 p.m. for an hour, millions of people around the world will turn off the lights and even iconic monuments in major cities will remain in the dark, for Earth Hour.
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