The Astrodome Opens as the World's First Domed Stadium
NRG Astrodome, NRG Parkway, Houston, Texas
CONFIRMED87% CONFIDENCEHappened as dated, per sabr.org[3]: "April 9, 1965: Astros beat Yankees in first game inside the Houston Astrodome."
The Houston Astrodome, the world's first fixed-roof, air-conditioned multipurpose stadium, opened on 9 April 1965 with an exhibition game between the Astros and Yankees — though it's stood closed and searching for a new use since 2008.
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