Bjorn Ironside has sailed down rivers and across the sea on quests of conquest and plunder.

Its exquisite and wonderful.

The backlot occupies several acres, so its huge.

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Jonathan Hession/History

The town of York just went on and on.

York I know very well because I was brought up right near there, he says.

It brought back my childhood of wandering down these very narrow lanes.

VIKINGSSeason 5, TKAlex Hogh as Ivar the Boneless

Jonathan Hession/History

The moment hes crashed it and leans up against the wheels, he realizes hes surrounded by Saxon warriors.

Being Ivar, the young conqueror doesnt beg for mercy.

He laughs at them and he taunts them, Hirst says.

VIKINGSSeason 5, TKJonathan Rhys Meyers as Bishop Heahmund

Jonathan Hession/History

A certain amount of mutual respect will eventually develop between Ivar and Heahmund, he explains.

The battle is completely dominated by the personalities of these two great and formidable warriors.

Its part of the growing ambition of the show, Hirst says.

You always need new blood, new places.

These things rejuvenate the show and everyone in it.

Well, except for the people who are going to die.

And this isVikings, so expect that, too!