The Kansas City Royals Jumbotron is currently the largest in professional sports at 84 feet wide and 105 feet tall, The Arizona Diamondbacks Jumbotron is the second largest. It is 144 feet wide and 55 feet tall. Both of these will soon take a back seat to the jumbotron at Cowboys Stadium when it opens in 2009, it will be 160 feet wide and 72 feet tall.
Giants stadium has the second most seating capacity
colts
ANZ stadium in Sydney (Formely known as Telstra Stadium or Stadium Australia) has a capacity of 82000.
Yankee Stadium
Spartan Stadium has a seating capacity of 75,005 people.
In 2009, the largest ballpark in Major League Baseball by seating capacity was the Michigan Stadium, which is not a baseball park but rather a football stadium. However, if referring to baseball-specific venues, the largest ballpark by outfield dimensions was the Polo Grounds, home of the New York Giants until 1957, but it was no longer in use in 2009. For current MLB stadiums, the largest by capacity at that time was the Los Angeles Angels' Angel Stadium, with a seating capacity of approximately 45,000.
Sun Devil Stadium has a seating capacity of 56,232 people.
Dodger Stadium in Los Angeles, California is the largest ballpark in the United States by seating capacity, with a capacity of around 56,000 seats. It is also the third-oldest ballpark in Major League Baseball.
150,000. The Rungrado May Day Stadium in Pyongyang, North Korea.
Atlanta-Fulton County Stadium's seating capacity for baseball was 52,007 and for football was 60,606. The stadium was imploded on August 2, 1997.
The Pennsylvania State University's Beaver Stadium. 110,000
If you mean by stadium, an amphitheater, Rome's largest was the Colosseum, having a seating capacity of 50,000. Now here's the tricky part, "stadium" in Latin could refer to a race course. If that's what you mean by the word stadium, it was the Circus Maximus which had a seating capacity of 150,000.