The symbol of Saga City: the ruins of the 360,000-koku castle of the Nabeshima clan. See the Shachihoko Gate and Tsudzuki Yagu, designated Important Cultural Properties of Japan.
Saga Castle was originally Murauchi Castle, belonging to the Ryuzouji clan, who ruled Saga. It was expanded and renovated by the father and son duo, Nabeshima Naosige and Nabeshima Katsusige, and completed in 1611. A flatland castle, Saga Castle's honmaru (main enclosure) measured approximately 126m east-west and 122m north-south. It is said that a four-story, five-tiered keep stood in the northwest corner, with stone walls approximately 9m high. The castle was surrounded by a wide moat (approximately 80m wide) and earthen ramparts, with pine and camphor trees planted on the ramparts to obstruct views into the castle. The castle suffered repeated fires and reconstructions. In 1874, during the Saga Rebellion led by Eto Shinpei, some buildings were destroyed. Remaining structures were gradually demolished over time, leaving only the Shachihoko Gate (the honmaru gate), the Tsudzuki Yagu (a connecting turret), and the stone walls. The Shachihoko Gate's white walls are topped with bronze shachihoko (ornamental mythical creatures), giving the gate its name. The gate and doors bear bullet marks from the Saga Rebellion, a stark reminder of the fierce battles fought there. Today, the moat and surrounding area comprise Saga Castle Park. Waterfowl and carp swim in the moat, and the park features fountains, lawns, and seasonal flowers such as cherry blossoms, azaleas, and lotuses. Along the moat are large camphor trees estimated to be over 300 years old, designated as prefectural natural monuments. Saga Castle Ruins offers a blend of history and nature, making it a leading tourist attraction in Saga.