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National Geographic has a gallery of stadiums from ancient Greek and Roman Times to modern ones with retractable roofs
Below is the Astrodome which in the 1960s was the first fully enclosed and air-conditioned stadium. It was also the first to use artificial turf, or, as it came to be known, AstroTurf. Ramp towers were added in 1989 in anticipation of the Americans With Disabilities Act.
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