If you're scared of heights, it may be time to look away now.
Floating on air: Visitors get their first view from The Ledge, four glass balconies suspended from the 103rd floor of Chicago 's Sears Tower
Fearless: Anna Kane, five, spreads out on the floor of the 10ft square box which is 1,353ft up
Spectacular: She also enjoyed amazing views out across the city
Thrillseekers: The boxes jut out four feet from the building and were specifically designed to make visitors feel as if they are floating
Unfazed: Although some adults felt dizzy after experiencing the Ledge, children seemed to take it in their stride
Long way up: Even the floor of the platforms are glass - few were brave enough to look straight down
Towering: A view of the Sears Tower (black building in the foreground). The Ledge is on the 103rd floor