The Adventure Playground at the Berkeley Marina was opened in 1979. It is a wonderfully unique outdoor facility where staff encourage children to play and build creatively. Come climb on the many unusual kid designed and built forts, boats, and towers. Ride the zip line or hammer, saw, and paint. By providing these low risk activities Adventure Playground creates opportunities for children to learn cooperation, meet physical challenges and gain self confidence. The concept for Adventure Playgrounds originated in Europe after World War II, where Lady Marjory Allen, a landscape architect and childrens advocate, studied children playing in the "normal" asphalt and cement playgrounds. She found that they preferred playing with parts that they could move around and manipulate to make their own makeshift structures. The formula for Adventure Playgrounds includes Earth, fire, water, and lots of creative materials.