KATHMANDU, Sept 22: Nepal Association of Tour and Travel Agents (NATTA) has organized various programs as part of the 39th World Tourism Day that is observed on September 27 every year across the globe. A clean-up campaign has been launched at religious and tourist place Swyambhu under the campaign. People from various walks of life like secretary of the Ministry of Culture, Tourism and Civil Aviation Krishna Prasad Devkota participated in the drive.