I've had to take family members to the A&E dept of our local hospital a few times, and I remember the panic I felt the first time when trying to find the entrance around 1am. Most hospitals these days seem to be enormously sprawling campuses that cover multiple city blocks; some internal roads are dead ends, others are one way and the whole place looks like it has been laid out by a madman. It's easy to see why anyone that didn't know the area would get lost, and our streets are nowhere near as complicated as London.