Say it with flowers. A trip to Kew, a suburb of London and former royal residence, reveals a 300-acre spread of gardens that gathers the world's largest plant collection into one dazzling park. A must for the green-thumbed, it's also a wonderful

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Say it with flowers. A trip to Kew, a suburb of London and former royal residence, reveals a 300-acre spread of gardens that gathers the world's largest plant collection into one dazzling park. A must for the green-thumbed, it's also a wonderful breather after a few days of hectic sightseeing in the city. Since London's often-dour climate isn't appropriate for all species, the curvaceous, glass-walled Palm House houses a tropical rainforest, and the Princess of Wales Conservatory features ten computer-controlled climactic zones and species ranging from exuberant orchids to starkly beautiful cactus. These and other structures are an architectural bonus. Features even include an airy treetop walkway through the canopy.

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