The East 24th Street Skybridge is one of my favorite Manhattan skybridges, connecting 1 Madison Ave and 11 Madison Ave: Decked out in gorgeous stainless steel, the bridge was erected at a time when both gargantuan buildings were owned by the Metropolitan Life Insurance Company. Today, the offices are primarily occupied by Credit Suisse, with the tower portion soon to become an upscale hotel. No word on whether the bridge is still in use, though working lights can be seen from the street.