Fodor's Expert Review Oxford Botanic Garden & Arboretum

Founded in 1621 as a healing garden, this is the oldest of its kind in the British Isles. Set on the river, the University of Oxford's diverse garden displays 6,000 species ranging from lilies to citrus trees. There are a spacious walled garden, six luxuriant glass houses, including insectivorous and lily houses, and interesting medicinal, rock, and bog gardens to explore. Picnics are allowed, but you must bring your own food and drinks, as there's nowhere to buy them inside.