Osaka Castle and the skyscrapers of Osaka Business Park, Kyōbashi
The Osaka castle area is in Osaka city.
This area consisting of many buildings surrounded by water is home to Osaka-castle, Osaka-jo Hall,
classical music halls, theaters where one can enjoy the performing arts, hotels, shopping and sports facilities
Osaka Castle (大阪城 Osaka-jō), (The park can be accessed on a number of lines, but the castle is closest to Osaka-jō Koen station on the JR Osaka Loop Line.), . 9AM-5PM daily, closed around New Years. Osaka's best known sight, although it's a concrete reconstruction that pales in comparison with, say, Himeji. Think of it as a museum built in the shape of a castle, rather than as an actual historical castle. Still, it's pretty enough from the outside, especially in the cherry blossom season when Osakans flock to the castle park to picnic and make merry. Naniwa Palace Site Park or Naniwanomiya can also be found south to Osaka Castle Park (although it's one of Japan's oldest habitats and palace sites, today it's little more than an empty grass field where the outlines of Naniwa's palace foundations from around 643 AD have been partly recreated in concrete).The grounds are free, and the castle costs adults ¥600, children free. edit
Osaka Science Museum (大阪市立科学館), (Walk from subway Higobashi Station or Yodoya-bashi Station, 500m and 900m to the west respectively.), . Tu-Su 9:30AM-5PM, closed Dec 28-Jan 4, closed on public holidays. Big interactive activity center on several floors. Great for kids. Planetarium and cinema (with science films) downstairs.Adults ¥600, children ¥300. edit
Osaka Museum of History (大阪歴史博物館), 1-32 Otemae 4-Chome Chuo-ku (5 min walk from subway Tanimachi 4-chome Station; also accessible via Osaka Castle or from JR Osaka-jō Station), . M-Th 9:30AM-5PM, F 9:30AM-8PM, closed Tuesday, or Wednesday of Tuesday is a holiday. An ideal place to learn all-abouts of Osaka's history. Enjoyable view over Osaka Castle and the OBP skyscrapers.¥600. edit