Half-Life 2's Citadel is 3 times taller than everyone thought, says guy who spent 9 years thinking about it

When visiting City 17, don't forget to check out the Citadel. You can't miss it: it's a massive black alien structure in the center of the city, looming over the remnants of the human race with Dr. Breen's cozy office occupying the top floor. Half-Life 2 begins at the foot of the Citadel and ends on its roof, with a slight detour to everywhere else in between...
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