My family and I made as many visits as about 8 or 9 times so far. It has never been the less. They take you to the top floor to the observatory. Side walk is Glass protected, but some part of it is net (I believe) which allows the visitor to feel the wind. Such a great view of chicago. You can see all the attractions, and feel like flying over them. There is a Lakefront view aroung the Lake shore drive which you can see clearly from here.
Go there in the afternoon to get beautiful snaps, but stay till dark to see how beautiful chicago looks in night. For more information visit this site: http://www.hancock-observatory.com/attractions.asp