When it comes to glass, the National Aviary on Pittsburgh’s North Side has a unique problem. Not only do officials there not want any of their more than 500 birds to fly into its windows and glass ceilings, but they also don’t want wild birds outside hitting it either. Window
Taking the kids: On a newly opened Cog Railway, one of only three in the U S msn.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from msn.com Daily Mail and Mail on Sunday newspapers.