Okunoin is a sacred cemetery located on Mount Koya in Japan, known for being the final resting place of Kobo Daishi, the founder of Shingon Buddhism. It features over 200,000 tombstones and memorials, reflecting the deep spiritual significance of the site. Visitors can explore the serene paths lined with ancient cedar trees, leading to the grand Gokusho Daito pagoda. The atmosphere is tranquil, making it a popular destination for those seeking reflection and connection to Japan's rich spiritual heritage.