A Hospital. Both Exterior (for fighting upon the steps of) and interior (with those "Institution Green" walls and beds with squeaky wheels). Complete with morgue and furnace in the "basement" (so Horror players will pick it up for their Zombie games). Include an operating room, nurse's station, and the "Secure wing" for criminal patients. Oh, and let's not forget the cafeteria, with its Deeeelicious and Nuuuutritious food.
A Mental Asylum/Sanitarium – almost the same thing as a hospital or hotel, but the doors are more "Secure", and there are guard stations, and a big room for everyone to sit around and play solitaire with a 51-card deck, make jigsaw puzzles, or just quietly shake in the corner.
A big train station on the Union Station/Grand Central Station model – waiting area, acess to the tracks, ticket offices, offices in the back, luggage & frieght areas, etc.
A museum. With different wall inserts for different types of exhibits – Egyptian/Ancient Near East; "Natural History" with cavement and animals in dioramas; "American History" with Indians in dioramas, technological marvels, etc.; "British Museum" with rooms of nothing but small clocks, piles of silver wire marked "Saxon Hoard found in a farm field in Kent, 1879", etc.
A Library – Large open reading area with desks and wooden nooks, the stacks, Librarian's desk, Circulation desk, back room for the "Secure Collection"
A grade school – sevral classrooms with different grades' work on the3 walls, the pricipal's office, infirmary, cafeteria, janator's closet
A High School – several classrooms with different subject's material on the walls, plus the rest of the grade school, above. Add a gymnasium for healthful physical activity.
A college – nearly the same as a highschool, but more advanced subjects' work on the walls, add professor's offices (including "Archeology Dept. Professor Henry Jones Jr", of course).
Remember to include washrooms/lavatories in everything!