Located across from Buckingham Palace and between Hyde Park and St James's Park, Green Park London is the smallest of London's eight royal parks, and has a special character that distinguishes it from the rest. Leprosy patients from the nearby St. James Hospital until the 16th century, and nowadays, the park is a peaceful retreat perfect for a great day outing in the great outdoors. The park's charm lies in the hundreds of trees and mature grasslands.