Doune Castle in Stirlingshire has been renamed Winterfell in honour of the final season of the hit fantasy drama.
The temporary takeover has been staged to coincide with the screening of the last every episode of the programme.
Members of the public have been encouraged to visit the locations with Doune Castle featuring in many of the scenes that take place in the city of Winterfell.
The takeover has been staged to promote the digital download of Game of Thrones: The Final Season.
"Doune Castle was featured as the location for Winterfell in the pilot episode so it’s fantastic to be chosen as the much-loved Westeros location now that the TV series is coming to an end.
"We hope fans of Game of Thrones across the country will visit Doune Castle and enjoy walking in the footsteps of Jon Snow and the Starks."
The signs will be available to visit for a limited time only to mark the Digital Download release of the Final Season.
Fans around the UK are challenged to find the signs and encouraged to post a selfie, tagging @HBO_UK (Twitter) / @HBOUK (Instagram) with the hashtag #GoTTakeover.