20. Kew Gardens
Kew Gardens or the Royal Botanic Kew Gardens is located in the Kew district of London. Here, you will get to witness as many as 30,000 different living plants. No other place on this planet has such a huge collection of this kind. That’s not all. The Kew Gardens is also home to the world’s biggest collection of preserved plant specimens; the number is as high as 7 million. Some of the must visit areas of the garden are the Waterlily House, Queen’s Garden, Woodland Garden and Bamboo Garden.