The first time I created a character in Praetoria, it was late at night and I noticed that the zone was deserted. Actually, it seemed unusually deserted, even for the late hour - I couldn't even see any NPCs. That's when the zombies started erupting from the ground near me - a just leveled up to 2nd level character, in a zone I'd never been in before, and, oh look!, there's a zombie invasion going on! I spent several minutes running about like crazy, trying to find a building that I could hide in, but all the ones I checked were purely decorative. Then I finally found the hospital; I promptly logged out for the night and came back the next day. No zombies then.
But I certainly always remembered where the hospital was in Nova Praetoria after that...