Hi Shiroi. From Momoyama Station, it would need approximately 15 minutes walk to get to the Fushimi Momoyama Castle. The current refurbished castle is closed to the public to go inside but the gardens and grounds around are open and is a popular picnic place, especially during the cherry blossom blooming time in spring. Momoyama Castle used to be really famous for its tea ceremony room in which both the walls and the implements were covered in gold leaf. While you may not be able to enter the castle, you may opt to take a short ten-minute walk along a path through the wooded area which leads to the tomb of Emperor Meiji, and this is the exact location where the original Fushimi Momoyama Castle stood.