Tennoji Park is a public park located in Osaka's Tennoji Ward, on the western edge of the Uemachi Plateau in an area called Chausuyamacho. It is about 5 minutes from Tennoji Station on foot. It contains the Tennoji Zoo, Greenhouse, Osaka City Museum of Fine Arts, and Keitakuen Garden. There's also an open lawn space in its center, cafes, restaurants, flower shops, kids playgrounds, and more. With a total area of 28,000 square meters, it once had a library, public hall, and open-air concert hall as well. Tennoji Zoo, in the western part of park, was opened in 1915 and has the third longest history of all the zoos in Japan. Keitakuen Garden is a Japanese garden designed and created by Ogawa Jihei VII. In 1926, Osakan merchants from the Edo period, the Sumitomo conglomerate donated it to the city. Inside is also Chausuyama, where Tokugawa Ieyasu had his stronghold during the winter campaign of the siege of Osaka, which was previously thought to be a large keyhole-shaped tumulus. In 1986, an excavation was made, and confrirmed it was the remnant of Tokugawa Ieyasu's stronghold and canal, putting the theory that it was a large, 200m tomb into question.