Akasaka Palace, a National Treasure of Japan, was built on the site of a large Edo-era (1603-1868) estate belonging to the Tokugawa clan. It is one of Japan’s largest and best remaining examples of a Meiji-era (1868-1912) building. A surprising bit of European aesthetic in Japan, the building and grounds are popular with locals and visitors alike.
The palace is often visited on sightseeing tours of the surrounding Akasaka area as well as some themed tours that focus on Japanese history and architecture. Independent visitors wanting to see the building can book tickets online for a specific time slot; you pay upon arrival. The grounds are free to explore and require no advance booking.