In the mid 90's I moved to south Florida to work for a large international firm and we had a large campus with many buildings, at least one if not more wiring closets on each floor of each building. Many of them look exactly like some of those pictures.
We had one, H2 it was called, that had so many cross-connect wires going between two sets of racks, that you walked on them - they completely covered the floor. It was almost like walking on snakes...