It’s probably the worst kept secret, but Penrhyn Castle have given the biggest hint yet that ‘Game of Thrones’ is being filmed at the National Trust site in Bangor, you may even have the chance to see some of the rooms set dressed for the production if you visit the Castle this weekend.

American production company Home Box Office (HBO) arrived two weeks ago and the Penrhyn castle has been closed on certain days, or open with restricted access, while filming has been taking place, but the nature of the filming has been a closely guarded secret.

It has been widely speculated that the filming was for the eighth and final season of Game of Thrones, which will premiere in 2019, filming for the series has taken place in Belfast and elsewhere in Northern Ireland, Canada, Croatia, Iceland, Malta, Morocco, Spain, and the United States.

In a Facebook post this afternoon Penrhyn Castle said: “Even with HBO filming, the castle is still open this weekend. Some rooms may be off limits or full of relocated collection but, excitingly, you may see others set dressed for the production.

“Weather looks great but wrap up warm because ……#WinterIsComing”

“Winter Is Coming” is the motto synonymous with Game of Thrones as well as being the first episode of the HBO medieval fantasy television series.

It had been widely reported that filming for Game of Thrones had finished in July and last week attention turned the likelihood of the ‘Watchmen’ being filmed at the site, when lead actor Jeremy Irons was seen dining at The Slate Restaurant in Tal y Bont celebrating his 70th birthday.

Filming will continue at Penrhyn Castle until 8th October when the sets will be removed and rooms deep cleaned, Penrhyn Castle returns to normal opening from 13th October.