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9. HUNTINGTON LIBRARY CACTUS GARDEN, USA

The Huntington is an educational and research institution and its botanical gardens are famous all over the world. The gardens are divided into various themes from all over the world (Australian, Camellia’s collection, Children’s Garden) and cover around 120 acres of land. It contains a whole bunch of rare plants from around the world. It has a dedicated portion of Tropical and Carnivorous plants. It has one the worlds largest and oldest collections of cacti along with with plants from extreme environments.