Kathmandu, an archival city rich in cultural heritage sites is known to be the capital city of Nepal. According to population census 2011 AD, the Kathmandu city alone accommodates 1,740,977 populations. Out of 10 sites listed in world heritage site list by UNESCO, 4 of them lie in Kathmandu valley, namely; Pashupatinath Temple, Boudhanath Stupa, Swayambhunath stupa and Patan Durbar Square.