Game of Thrones: The Last Watch trailer still

With just one episode of "Game of Thrones" left, HBO has released the trailer for its upcoming documentary centered on the show.

Called "Game of Thrones: The Last Watch," the two-hour documentary follows the making of the eighth season and goes along on the emotional ride with the cast and crew. It's directed by filmmaker Jeanie Finlay, who was on set throughout Season 8 production. HBO calls the documentary "a farewell to Westeros with the people who built the realm."

The preview shows glimpses of the cast, and it also highlights the hard work of all the people involved behind the scenes. We see people working when there's barely light in the sky, in freezing conditions, and more. It's certainly a unique window into the Seven Kingdoms, as you'll see below.

The "Game of Thrones" series finale airs Sunday, May 19 at 9 p.m. ET/PT on HBO. "The Last Watch" follows a week later, on Sunday, May 26, at the same time.