Kirosan Observatory Park on Oshima Island offers stunning panoramic views of the Seto Inland Sea from its perch atop Mt. Kirosan. Designed by architect Kengo Kuma, this observatory blends seamlessly with the natural surroundings and provides a perfect spot to take in the beauty of the sea and the connecting bridges. Don't forget to check out the shop at the base for souvenirs and snacks to enjoy while soaking in the scenery!