Also, the largest enclosed space on the face of planet Earth. If you are not careful, it is quite possible to get lost there for days and days without food or water. A tourguide and a map (along with a GPS) are highly recommended.
Person #2: Yeah...
Person #1: You sound disappointed.
Person #2: Well, it's really small, and behind 4 feet of bullet-proof glass! You could hardly see it.
Excuse me, sir, but we've been lost here for 4 days and nights without food or water. Please show us the way to the exits.