Kokyo (castle in tokyo) is one of the largest park in tokyo. Kokyo meaning is the house for royal familly.
Now, half parts of the kokyo is still house for royal family. However, half of them are opened for park. Several years ago, it is opened for public. Before the day, it was opened for special days as a season of cherry blossom or autumn leaves.
Now, most day except monday and friday are opened. (You should check exact schedule before to go) LInk
When the Edo Period, the castle was a house for Shogun family ( Main General) So, stone walls are so sharp angle. I think I dont want to climb such wall....
Following photos are from a place where it had main tower.
I don't know when the main tower was removed or broken. But i did not know the castle also had a main tower.
Well, Kokyo has many histories to build it. So, many places has different stile of building for stone wall. Like as head of this article, the stone wall is built just after to start a city of Edo. So, this stile is quite diffence with this kind of stone wall.
You can see views which has old and new Tokyo.
I think this was head of main tower. (Im not sure. I did not read this explain board....)