Asian Elephants at Oregon Zoo © Stuart Seeger
The award-winning Oregon Zoo is the oldest of its kind west of the Mississippi, founded in 1887. It covers 64 acres and is home to a vast variety of animals, including elephants, penguins, and polar bears. With the animals housed in their natural habitats, 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 old-fashioned railway ride connecting Washington Park, Oregon Zoo is one of the most popular tourist attractions in Portland. It draws around a million visitors a year. Opening times vary depending on the season so it's best to check the official website listed below for details.