The Hakone Open Air Museum is a must see on any visit to Hakone. Stretched out over a grassy hillside, the park features sculptures by leading international artists, some indoor exhibitions of sculpture, and a pavillion with works by Picasso. Artists with works of art on display include Henry Moore, Constantin Brâncuși, Barbara Hepworth, Rokuzan Ogiwara, Taro Okamoto, and Kōtarō Takamura. The Picasso Pavillion contains 300 pieces by the very prolific Pablo Picasso.