Nowhere does botanical better than Kew Gardens, which boasts the largest and most diverse botanical collections in the world. Opened in 1759, the London garden, once the playground of royalty, spans 130 hectares of luscious landscape, providing the ideal peaceful retreat from the fast pace of the capital city. Explore the garden’s Great Broad Walk Borders, Temperate House and Kew Palace, the smallest of all the British royal palaces. Then, head up to the Treetop Walkway and take in expansive views from 59 feet off the ground.