Imperial Palace 皇居
The Imperial Palace, located on the former site of Edo castle, is the current residence of the Imperial family.
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You have to book to get into a lot of the grounds, but there is one section of the park that is free and open to the public during set hours. It is stunning in Autumn with the ginkgo trees and autumn leaves.
Be aware that you likely won't get to enter some sections of the park, depending on what time of the year it is. I was told that the whole area is open during the New Year and the emperor's birthday. Not sure about that though.
On a sunny day, it's fun to visit the palace and enjoy the sunlight. There is an open field in the middle of all of the greenery; it's barren but somehow goes along with the whole setting. You can also explore a small museum in the palace that displays multiple traditional Japanese ink prints. What's a real adventure is walking around the whole perimeter of the palace. While walking around, you can see a blend of the traditional architecture of the imperial palace and the modern architecture of the rest of the city in the background.