Grab a sick-bag and strap yourself in – you’re in for one hell of a ride at BFI IMAX. Britain’s largest cinema screen is more than 20 meters high and 26 meters wide. And if that’s too lofty for your brain to take in, consider this – that’s nearly five double-decker buses stacked on top of each other! We’re feeling sick just thinking about it. But if gargantuan screens aren’t your thing, the building, designed by award-winning architect Bryan Avery, is every bit as impressive.