Covering 4 1/2 acres of hillside in the West Hills above downtown Portland, these are among the largest and oldest rose test gardens in the United States and are the only city-maintained test gardens to bestow awards on each year's best roses. The gardens were established in 1917 by the American Rose Society and are used as a testing ground for new varieties of roses. Though you will likely see some familiar roses in the Gold Medal Garden, most of the 400 varieties on display here are new hybrids being tested before marketing. Among the roses in bloom from late spring to early winter, you'll find a separate garden of miniature roses. There's also a Shakespeare Garden that includes flowers mentioned in the Bard's works. After seeing these acres of roses, you'll understand why Portland is known as the City of Roses and why the Rose Festival in June is the city's biggest annual celebration. The small Rose Garden Store (tel. 503/227-7033), is packed with rose-inspired products.