Osaka Castle, located in Chuo-ku, Osaka, is one of Japan's most iconic castles and was built by Toyotomi Hideyoshi. Its grand history and architecture are important testaments to the struggle for power and cultural progress during Japan's Warring States and Edo periods. Construction of the castle began in 1583. Toyotomi Hideyoshi built Osaka Castle as a political and military base in the process of unifying the country. Its grand structure was modeled after Azuchi Castle and is characterized by high stone walls and a vast moat. The castle was lavishly decorated with gold leaf, symbolizing the prosperity and authority of the Toyotomi family. However, the Toyotomi family's era came to an end when they were defeated by Tokugawa Ieyasu's forces in the “Osaka Summer Battle” of 1615. Osaka Castle was then rebuilt and administered under the direct control of the Tokugawa shogunate. Throughout the Edo period, the castle underwent numerous renovations and served as a strategic base. In the Meiji period, Osaka Castle was partially demolished and the ruins of the castle were used as a military facility. Later, in 1931, the castle tower was rebuilt with the support of the citizens. The rebuilt castle tower is a reinforced concrete structure, but its exterior faithfully reproduces the traditional castle design. Today, Osaka Castle is maintained as a historical park and is a popular destination for many tourists. The castle keep is used as a museum, where materials related to Toyotomi Hideyoshi and the Warring States period are on display. There are also beautiful gardens and open spaces around the castle, which attract many visitors, especially during the cherry blossom season. Osaka Castle has been a symbol of Japan's historical and cultural transition from the Warring States Period to the present day, and continues to be loved by many people.