9. Kew Royal Botanic Gardens – UK
The land of 132 hectares was established among lemon groves. Under their domes, botanical science and privacy are united. It is only 10 km from London. Temperate House is the largest lemon garden from the Victorian era. There are trees older than 150 years in the Bonsai House. Under the sloping glass ceiling of the Palm House, baobab trees and vanilla orchids grow in ten climatic areas. Queen Charlotte’s hut made for royal picnics and citrus made for lunch is fascinating.