The Bagmati River which flows through Kathmandu is considered a holy river both by Hindus and Buddhists, and many Hindu temples are located on the banks of this river. The importance of the Bagmati also lies in the fact that Hindus are cremated on its banks, and Kirants are buried in the hills by its side. According to the Nepali Hindu tradition, the dead body must be dipped three times into the Bagmati before cremation. The chief mourner (usually the first son) who lights the funeral pyre must take a holy riverwater bath immediately after cremation. Many relatives who join the funeral procession also take bath in the Bagmati River or sprinkle the holy water on their bodies at the end of cremation as the Bagmati is believed to purify people spiritually.


Legendary Princess Bhrikuti (7th-century) and artist Araniko (1245 - 1306 AD) from that tradition of Kathmandu valley played a significant role in spreading Buddhism in Tibet and China. There are over 108 traditional monasteries (Bahals and Bahis) in Kathmandu based on Newar Buddhism. Since the 1960s, the permanent Tibetan Buddhist population of Kathmandu has risen significantly so that there are now over fifty Tibetan Buddhist monasteries in the area. Also, with the modernization of Newar Buddhism, various Theravada Bihars have been established.


Kirant Mundhum is one of the indigenous animistic practices of Nepal. It is practiced by Kirat people. Some animistic aspects of Kirant beliefs, such as ancestor worship (worship of Ajima) are also found in Newars of Kirant origin. Ancient religious sites believed to be worshipped by ancient Kirats, such as Pashupatinath, Wanga Akash Bhairabh (Yalambar) and Ajima are now worshipped by people of all Dharmic religions in Kathmandu. Kirats who have migrated from other parts of Nepal to Kathmandu practice Mundhum in the city.


Sikhism is practiced primarily in Gurudwara at Kupundole. An earlier temple of Sikhism is also present in Kathmandu which is now defunct. Jainism is practiced by a small community. A Jain temple is present in Gyaneshwar, where Jains practice their faith. According to the records of the Spiritual Assembly of the Baha'is of Nepal, there are approximately 300 Baha'is in Kathmandu valley. They have a National Office located in Shantinagar, Baneshwor. The Baha'is also have classes for children at the National Centre and other localities in Kathmandu. Islam is practised in Kathmandu but Muslims are a minority, accounting for about 4.2% of the population of Nepal.[citation needed] It is said that in Kathmandu alone there are 170 Christian churches. Christian missionary hospitals, welfare organizations, and schools are also operating. Nepali citizens who served as soldiers in Indian and British armies, who had converted to Christianity while in service, on return to Nepal continue to practice their religion. They have contributed to the spread of Christianity and the building of churches in Nepal and in Kathmandu, in particular.


Institute of Medicine, the central college of Tribhuwan University is the first medical college of Nepal and is located in Maharajgunj, Kathmandu. It was established in 1972 and started to impart medical education from 1978. A number of medical colleges including Kathmandu Medical College, Nepal Medical College, KIST Medical College, Nepal Army Institute of Health Sciences, National Academy of Medical Sciences (NAMS) and Kathmandu University School of Medical Sciences (KUSMS), are also located in or around Kathmandu.


Football and Cricket are the most popular sports among the younger generation in Nepal and there are several stadiums in the city. The sport is governed by the All Nepal Football Association (ANFA) from its headquarters in Kathmandu. The only international football stadium in the city is the Dasarath Rangasala Stadium, a multi-purpose stadium used mostly for football matches and cultural events, located in the neighborhood of Tripureshwor. It is the largest stadium in Nepal with a capacity of 25,000 spectators, built in 1956. Martyr's Memorial League is also held in this ground every year. The stadium was renovated with Chinese help before the 8th South Asian Games were held in Kathmandu and had floodlights installed. Kathmandu is home to the oldest football clubs of Nepal such as RCT, Sankata and NRT. Other prominent clubs include MMC, Machhindra FC, Tribhuwan Army Club (TAC) and MPC.


The total length of roads in Nepal is recorded to be (17,182 km (10,676 mi)), as of 2003–04. This fairly large network has helped the economic development of the country, particularly in the fields of agriculture, horticulture, vegetable farming, industry and also tourism. In view of the hilly terrain, transportation takes place in Kathmandu are mainly by road and air. Kathmandu is connected by the Tribhuvan Highway to the south, Prithvi Highway to the west and Araniko Highway to the north. The BP Highway, connecting Kathmandu to the eastern part of Nepal is under construction.


The main international airport serving Kathmandu and thus Nepal is the Tribhuvan International Airport, located about six kilometers (6 km (3.7 mi)) from the city centre. Operated by the Civil Aviation Authority of Nepal it has two terminals, one domestic and one international. At present, about 22 international airlines connect Nepal to other destinations in Europe, Asia and the Middle East, to cities such as Istanbul, Delhi, Kolkata, Singapore, Bangkok, Kuala Lumpur, Dhaka, Islamabad, Paro, Lhasa, Chengdu, and Guangzhou. A recent extension to the international terminal has made the distance to the airplanes shorter and in October 2009 it became possible to fly directly to Kathmandu from Amsterdam with Arkefly. Since 2013, Turkish Airlines connects Istanbul to Kathmandu. Regionally, several Nepali airlines operate from the city, including Agni Air, Buddha Air, Cosmic Air, Nepal Airlines and Yeti Airlines, to other major towns across Nepal.


Kathmandu Metropolitan City (KMC), in order to promote international relations has established an International Relations Secretariat (IRC). KMC's first international relationship was established in 1975 with the city of Eugene, Oregon, United States. This activity has been further enhanced by establishing formal relationships with 8 other cities: Motsumoto City of Japan, Rochester of the USA, Yangon (formerly Rangoon) of Myanmar, Xi'an of the People's Republic of China, Minsk of Belarus, and Pyongyang of the Democratic Republic of Korea. KMC's constant endeavor is to enhance its interaction with SAARC countries, other International agencies and many other major cities of the world to achieve better urban management and developmental programs for Kathmandu.