If you read about the history of computing, you'll hear how the first computers were "huge". You will often come across assertions that in the early days of commercial computing, a single computer would be "so big that it filled an entire building".
Now, poking around Wikipedia, I can find plenty of photos of old computers the size of an entire server rack, or several server racks. But I can't seem to find any pictures of a computer filling an entire room, much less a whole multi-story building.
Are these claims of a computer "filling an entire building" actually accurate, or is that a wild exaggeration? I can well imagine if you just paid a few million USD for a computer, you probably put it in its own special room with locked doors. But do any of these systems really fill a whole building? Do any of them really "fill" a whole room? Most pictures seem to just show a mostly empty room with cabinets across one wall.