Photo: M.O. Stevens License: CC BY-SA 3.0

The Oregon Zoo includes the 2 ft 6 in (762 mm) narrow gauge Washington Park & Zoo Railway that connects to the International Rose Test Garden inside the park.

Opened in 1888 after a private animal collector donated his animals to the City of Portland, the 64-acre (26 ha) zoo is now owned by the regional Metro government.

The Oregon Zoo is Oregon's largest paid and arguably most popular attraction, with more than 1.6 million visitors in 2008 to 2009.