The last shaded out spot on the map is a building next to where you climb down to go to the radio station. I can't figure out how to get the building discovered. I checked the Answers section, it says to climb up on stuff sticking out of the building but there's nothing I can find to climb up. Can anybody give me other ideas or tell me what I'm not seeing please? Thanks.
Start on the side of the building towards the radio station. I'd love to describe it for you but a youtube vid (search the challenge name) would be much clearer in showing you. --- It's raining luggage and babies and limbs and Daddy doesn't come home.