東京ドーム
On March 17, 1988, the Tokyo Dome, Japan's first domed stadium, opened its doors for the first time on the grounds of the old Korakuen Stadium. It is the home field of the Yomiuri Giants, and has hosted MLB, NBA, and NFL games as well (not to mention a long litany of unspeakable pop stars). The "Big Egg," as it's sometimes called, is located next to Suidobashi station on the JR Chuo line, in Bunkyo Ward.
The dome's architecture is interesting: its roof is actually a flexible membrane, held in place 90 feet above the playing field by air pressure differential. The difference is imperceptible to spectators and players inside, but is enough to keep the ceiling from crashing down on them. To keep the pressurization intact, all the entrances and exits to the stadium use revolving doors. Center field is 400 feet deep: the walls in left and right are 328 feet.
The Tokyo Dome is also the location of Japan's Baseball Hall of Fame, and a major amusement park with roller coasters and other rides.
There are two other domed stadiums in Japan: Osaka Dome and Fukuoka Dome. | 
