Kew Gardens, England
Founded in 1840, Kew Gardens, in Richmond, is the world's largest collection of living plants. Its living collection includes over 30,000 different species of rare and beautiful plants. In addition, the gardens, which were put on the UNESCO list of World Heritage Sites in 2003, boast a lot more. You can explore over 1.3 km² of landscapes and gardens, stroll a soaring treetop walkway and wander through tropical glasshouses reaching up to 27°C. The world’s most famous gardens will also amaze you with its art galleries, a serene lake, water lily pools and Princess of Wales Conservatory, where you can travel through 10 climatic zones.