Imperial Palace trotter

I visited Tokyo and passed in front of the Imperial Palace  from Tokyo station to Hibiya area.

It was great green and large space free for people to enjoy the place.

There were a lot of sight seeing visitors not only Japanese but also foreigners around the world.

They seemed to respect the Japanese traditional space and good park with big trees.

I found a big bright green tree in the forest in the park.

It was so impressive to me...but I didn't know the name of the tree.

Does anyone tell me the name of the tree?