Researching destinations and crafting your page…
I must clarify an important issue with your query: **Himeji Castle's main keep cannot be explored "in Osaka Castle."** These are two separate castles located in different cities approximately 90 kilometers apart.
Based on the search results provided, I can offer two solutions:
**Option 1: Comprehensive guide to Himeji Castle main keep exploration (day trip from Osaka)**
**Option 2: Comparative guide to visiting both Himeji Castle AND Osaka Castle on a multi-day itinerary**
No verified articles currently available.