Darjeeling is popularly known as the "Queen of the Hills" and produces the famous Darjeeling Tea, one of the world's finest teas. It is also home to the Darjeeling Himalayan Railway, a World Heritage Site. Darjeeling with its natural beauty provides a wide variety of activities from liesurely scenic walks to more gruelling activities such as trekking and river rafting for the adventurous ones. The Darjeeling Himalayan Railway (DHR) is the first, and still the most outstanding example of a hill passenger railway. It was inscribed on the list of World Heritage sites. Only two railways have this status, the Semmering Railway in Austria being the other.