Asian Elephants at Oregon Zoo © Stuart Seeger
The award-winning Oregon Zoo is the oldest zoo west of the Mississippi, founded in 1887. It covers 64 acres and is home to a vast variety of animals, including Asian elephants, Peruvian penguins and Arctic polar bears. All are housed in their natural habitats, and the zoo is an internationally recognised centre for wildlife preservation and research. Combined with a programme of summer concerts, a variety of seasonal events and an olde worlde railway ride which connects to Washington Park, the zoo is Portland's favourite attraction, drawing around a million visitors a year. Visitors should note that opening times vary depending on the season: check the official website listed below for details.