Credit: HBO

Filming for Game of Thrones Season 4 has taken place across three countries: Iceland, Croatia, and Northern Ireland. A new featurette released by HBO takes a look at the latter, with the focus being on what it was like to film in Belfast, the capital of the country.

The video shows a number of new locations we’re going to see in Season 4, including Mole Town, which is the closest settlement in Westeros to Castle Black. The video reveals that the set used for Mole Town will actually be pulling double-duty, with its reverse side providing an unspecified location in the Riverlands. We also get a peek at a forge underneath the Red Keep in King’s Landing, where we glimpse Tywin Lannister hefting an impressive-looking sword in temperatures that reach 1,000 degrees Celsius. We also see the Dreadfort, home of House Bolton, which is filmed at a real-life castle!

We’ve heard before that Season 4 will be the show’s biggest yet, and the show’s location manager Robert Boake confirms it in this video, saying, “Definitely from my perspective, [Season 4 is] bigger than previous years, and just not from the budget side of things, it took a lot more to service than the previous series. Yeah, we’re definitely growing and continue to do so it seems like.”

You can check out the 3 minute video below.

Catch the Game of Thrones Season 4 premiere on April 6, 2014 at 9 p.m. ET/PT on HBO.