Nijo Castle is a historic site located in Kyoto, Japan. Built in 1603, it served as the residence of the shogun during the Edo period. The castle is known for its beautiful gardens, intricate architecture, and the famous "nightingale floors," which chirp when walked upon to alert against intruders. The castle complex includes several buildings, with the main structure being the Ninomaru Palace. This palace features stunning wall paintings and tatami mat rooms, showcasing traditional Japanese design. Nijo Castle was designated a UNESCO World Heritage Site in 1994, highlighting its cultural and historical significance.