Takiyama castle was said to be built in the Warring period in Japan on this moutain area in 1521. This castle was used till about 1570. Today we cannot see any building ruins of the castle but some earthen walls or a well. This area is famous for the many (about 5 thousand) trees of Sakura. The place in the photo is surrounded by U-shaped hill with full of Sakura. People are enjoying to see the blossoms and kids are playing under the tree.
Tama area is the name of the western part of Tokyo Metropolis. It consists of 26 cities, 3 towns and a village. A lot of people (about 4 milion) live in a eastern half part of the area. However, there are many mountains in the western part of Tama area, and there are very little flat land. Many hiking spots are in the western area, so you can enjoy walking on the trail, camping, and so on. If you see the beautiful mountain scene, you may not believe this is also in Tokyo.