The Hilton hotel brand has launched an Earth Hour-themed contest that offers participants the chance to win a five-night vacation in Iceland.
For the contest, participants are invite to send photos of how they observed the World Wildlife Fund-organized event Saturday, which asks people to turn off their lights for an hour to save energy.
Photos must include the hashtag #TravelwithPurposeContest and #EarthHour and can be shared on Facebook, Twitter and Instagram.
The winner will be awarded a five-night stay at the Canopy by Hilton Reykjavik City Centre in Iceland.
The contest is now open and closes April 1. The winner will be announced on Earth Day, April 22.
For details, visit Hilton's Facebook page.