Come and explore Shimabara Castle, a striking white fortress that stands proudly against the backdrop of Mount Unzen. As you wander through the reconstructed five-story keep, you'll uncover the deep and often tumultuous history of the region's Christian heritage and the famous Shimabara Rebellion. Don't miss the climb to the top floor; the panoramic views of the city and the shimmering Ariake Sea are absolutely worth it. The castle grounds and surrounding museums offer a peaceful retreat, making for a visit of about an hour and a half.