Princess Nourah bint Abdulrahman University (PNU)

Delivered on an extraordinary fast-track schedule on royal-granted North Riyadh land, Princess Nourah bint Abdulrahman University spent US$5.3 billion building 14 colleges, a 700-bed teaching hospital, a 5-million-volume library, 40,000 m² of rooftop solar thermal arrays, and an 11.5 km automated campus metro for up to 60,000 students. PNU secures #5 right behind Paris-Saclay (#4) and ahead of Oxford's £4B OUD partnership (#6). Its verified US$5.3 billion single-phase construction bill (excluding North Riyadh land) makes it one of the fastest mega-projects ever completed—mobilizing 75,000 workers at peak.