The main bullpen on the CIA set is where most of the action takes place on 24: Live Another Day and though the image only showcases the central area, there are a lot of unseen areas viewers will discover. Under the columns on the left is a large conference table for likely debriefs, for instance. “There’s a whole world beyond it -- of offices and corridors that go all around the back," Lee says, adding that the CIA set was the most challenging to conceptualize "because it didn't exist."

Jack Bauer is ready for action, but this time, he's heading across the Atlantic.

24: Live Another Day, Fox's 12-episode revival, premieres on Monday, May 5 with familiar faces back in Jack's orbit. One thing that's different? The London setting. Because of the change in location, producers specifically sought out production designer Jonathan Lee, a British native, to dream up the expansive sets The mandate was simple: Infuse as much of the U.K. and each set should be distinct from the other.

EXCLUSIVE PHOTOS: '24: Live Another Day' First Look at the London Set

From the moment he signed on to the first day of filming, Lee had only eight weeks to conceptualize and design the various sets, which include the main CIA headquarters (there is no CTU this season), the presidential residence and Chloe's hacker corner, which The Hollywood Reporter exclusively debuts. "We were feeding back mood boards and designs to Jon [Cassar] and producers [Evan Katz and Manny Coto]," Lee tells THR of the accelerated timeline.

The 24 producers were clear about their vision for the reboot. "Evan and Manny were interested in really wanting to feel that they were in Britain," Lee says. "They wanted to feel the British vibe where possible. It enabled me to go for broke in looking for very obvious British icons that reinforced our British history and traditions." Meanwhile, Cassar "had another spin on it and that was to have all the sets contrasting with each other," Lee explains.

VIDEO: '24: Live Another Day' Promo: 'You're Looking at a World War'

Lee also looked to previous seasons as springboards for his designs, specifically season five, which producers felt "they got right." "It was very educational because there's a certain style in which 24 is filmed. Watching the previous shows was absolutely vital to understanding the visual language of 24," Lee says, adding that he "wanted to make sure I put my own stamp on it." Films such as Three Days of Condor, which had a similar locale (a CIA substation in a period building), and Gosford Park, were integral.

"The great thing about coming to Britain is we can offer many centuries of distinct periods of architecture," Lee says. "We have running through the show eight different centuries of architecture." Among them: the late-18th century for the president's residence and a 14th-century house, Dourney Court, for one of the villains.

What do you think of the new 24 set? For exclusive images, go here.

Email: Philiana.Ng@THR.com

Twitter: @insidethetube