This article is about a structural feature. For the expression concerning limitations on advancement, see glass ceiling. For the 2004 Maritime album, see Glass Floor.

Looking through the Glass Floor of the Blackpool Tower in Lancashire, England.

A glass floor is a transparent section of a floor, found most often in buildings (usually in the observation decks of towers) or boats in order to facilitate viewing directly beneath where one is standing.

Usually made of a reinforced glass, the most common use is as a tourist attraction. Glass-bottom boats are popular for allowing a better view into the water. Glass as a flooring material is used in both residential and commercial structures. Special hollow glass blocks known as glass pavers are often used in combination with a metal frame.

At 4000 feet (1219 m), the highest glass floor above ground is the novel outdoor application of the Grand Canyon Skywalk, operated by the Hualapai Indian tribe. The highest above ground level in a freestanding structure is in the CN Tower in Toronto, Ontario at 1122 feet (342 m).

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Spinnaker Tower

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