"This is where everyone stops to smell the roses in the Rose City. Celebrating its centennial in 2017, the International Rose Test Garden is the nation’s oldest continually operating rose test garden (where varieties are evaluated for characteristics such as disease resistance, bloom size, and fragrance). Originally conceived as a way to preserve different varieties of European roses from the destruction of World War I, the garden today contains 10,000 plants across 4.5 acres in Washington Park. Best of all, it’s completely free, whether you want to compare green thumbs with professionals or take in the views of Mount Hood while breathing in the perfumed air."