HBO has hidden six secret thrones in different locations across the globe ahead of the premiere of Game of Thrones' final season.
The network has revealed a series of 360-degree videos showing the first throne, which appears in an unknown forest.
A countdown timer has appeared on a special website set up for the campaign. When the timer runs out - or after the first throne is claimed - a video of the next thrones' location will be revealed.
The campaign also asks fans to "bleed for the throne" by donating blood, linking to the nearest Red Cross blood drive.
