The Temperate House is the largest of the glasshouses at the Royal Botanic Gardens, Kew; in fact it's the largest, extant Victorian glasshouse in the world. Despite this fact, many visitors never reach it because it's a fair way from the main gate and it's hidden from view until you're almost upon it.
This is a shame because the Temperate House contains some fabulous specimens, including the world's rarest plant - a cycad called Encephalartos woodii - and the world's largest indoor plant, the 52-foot high Chilean Wine Palm.
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