Kaivopuisto, or in spoken language, Kaivari is one of the oldest and best known parks in central Helsinki, Finland, and also a neighborhood of about 500 where the park is located. Kaivopuisto offers several hectares of parkland, both on flat land and on cliffs. The park also includes traces of stone fortifications built in the 18th century. Every summer, thousands of Helsinki citizens come to Kaivopuisto to sunbathe, picnic or play sports. The largest hill in the park is a favorite sledding trail during the winter.