Ueno Castle, also known as Ueno Park, is a historic site located in Tokyo, Japan. Originally built in the early 17th century, it served as a military stronghold during the Edo period. The castle was destroyed in the late 19th century, but its grounds were transformed into a public park, which is now a popular destination for both locals and tourists. Today, visitors can explore the remnants of the castle, including the Tōshō-gū Shrine, which honors Tokugawa Ieyasu, the founder of the Tokugawa shogunate. The park is also home to museums, cherry blossoms, and a zoo, making it a vibrant cultural hub in the heart of Tokyo.