Final answer:
The Houston Astrodome opened on April 9, 1965, and was known as the first multi-purpose, domed sports stadium, setting the precedent for future indoor stadiums.
Step-by-step explanation:
The Houston Astrodome, officially known as the Harris County Domed Stadium, opened its doors on April 9, 1965. It was the world's first multi-purpose, domed sports stadium, earning the nickname "The Eighth Wonder of the World." The Astrodome was home to the Houston Astros baseball team and the Houston Oilers football team. Its innovative design featured a domed roof, comfortable air conditioning, and luxurious seating, paving the way for future generations of indoor stadiums.