Recently the Sears Tower in Chicago has installed a glass-floored observation deck - 1,353ft up in the air.Visitors can step out on to one of four glass boxes jutting out of the huge 110-storey office building.
It is called The Ledge. It has transparent walls and ceilings and is designed to give people a "floating sensation". It is made from glass just half-an-inch thick jutting out from the indoor observation deck.
Architect Ross Wilmer said: "We did studies that showed a 4ft deep enclosure makes you feel like you're floating since there's only room for one row of people, not two."
The new deck, on the 103rd floor of the building, is already attracting up to 25,000 visitors a day to the building, which opened in 1973.
Margaret Kemp, of Bishop, California, said: "It's like walking on ice - on the first step you feel you're going to fall."
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