The Kyoto Imperial Palace, known as the Gosho in Japanese, is a walled complex that sits in the middle of the Kyoto Imperial Palace Park. While no longer the official residence of the Japanese emperor, it's still a grand edifice.
The original imperial palace was built in 794 and was replaced numerous times after destruction by fire. The present building, on a different site and smaller than the original, was constructed in 1855. Enthronement of a new emperor and other state ceremonies are still held here.
The Gosho does not rate highly in comparison with other attractions in Kyoto and you must apply for permission to visit. However, the surrounding Kyoto Imperial Palace Park is open to the public from dawn to dusk and can be visited freely without any application procedure. It's Kyoto's premier green space.