London's Kew Gardens is a botanical garden located in the southwest of London. It is one of the world's most famous and largest botanical gardens, with over 50, 000 different species of plants. The gardens were founded in 1840 and are now a UNESCO World Heritage Site. Kew Gardens is home to many rare and endangered species of plants, as well as a number of historic buildings and monuments. Visitors can explore the gardens and learn about the history of the site, as well as enjoy the beautiful scenery.