Baseball in Japan: Fukuoka Softbank Hawks
It's still really cool to watch.
The Hawks have been playing in Fukuoka since 1988, and have been owned by Softbank since 2005. Fukuoka Dome (Fukuoka Yahoo! JAPAN Dome) was built in 1993, and has a retractable roof. It was a nice day when I was there, so I'm not sure why it wasn't opened.
To get to the stadium and Hawks Town (the shopping mall and hotel complex) get off the subway at Tojinmachi Station and use exit 3, making a right turn to follow the river/aquaduct. Make a left turn at the major intersection to cross over the river, and the complex will be on the right. You can either enter the mall and head to the second floor where the Hawks store and narrow pedestrian bridge to the stadium is, or follow the road to the stadium (behind the mall) and walk up the stairs - either way, you shouldn't have trouble finding it. Tickets to Sunday games should be bought in advance (I suggest asking in a Lawson convenience store for some help using the ticket machines) but otherwise you should be able to walk up and get tickets on game day.