The Children's Museum built a substantial (1.3-acre (0.53 ha)) outdoor play area on its grounds in 2014 called "Outdoor Adventure".[23] The Washington Park Master Plan calls for Outdoor Adventure to be maintained as a public nature play area following the museum's closure.[24] The Oregon Holocaust Memorial was dedicated to the victims of the Holocaust on August 29, 2004.[4] The Himalayan Cloud Forest Garden, created around 2010 on a 3-acre site at the northern end of the park, displays a collection over 200 rhododendron species and hundreds of companion plants primarily from the Sino-Himalayan region.[25][26]