Swayambhunath (Devanagari: स्वयम्भूनाथ स्तुप; sometimes romanized Swoyambhunath) is an ancient religious complex atop a hill in the Kathmandu Valley, west of Kathmandu city. It is also known as the Monkey Temple as there are holy monkeys living in the north-west parts of the temple. The Tibetan name for the site means ‘Sublime Trees’ (Wylie:Phags.pa Shing.kun), for the many varieties of trees found on the hill. However, Shing.kun may be a corruption of the local Newari name for the complex, Singgu, meaning ‘self-sprung’. For the Buddhist Newars in whose mythological history and origin myth as well as day-to-day religious practice, Swayambhunath occupies a central position, it is probably the most sacred among Buddhist pilgrimage sites. For Tibetans and followers of Tibetan Buddhism, it is second only to Boudhanath.
The Swayambhunath complex consists of a stupa, a variety of shrines and temples, some dating back to the Licchavi period. A Tibetan monastery, museum and library are more recent additions. The stupa has Buddha’s eyes and eyebrows painted on. Between them, there is something painted which looks like the nose – but is the Nepali symbol of ‘unity’, in the main Nepali language dialect. There are also shops, restaurants and hostels. The site has two access points: a long stairway, claimed to have 365 steps, leading directly to the main platform of the temple, which is from the top of the hill to the east; and a car road around the hill from the south leading to the southwest entrance. The first sight on reaching the top of the stairway is the Vajra.
Swayambhunath is also known as the Monkey Temple as there are holy monkeys living in the north-west parts of the temple. They are holy because Manjushree, the bodhisattva of wisdom and learning was raising the hill which the Swayambhunath Temple stands on. He was supposed to leave his hair short but he made it grow long and head lice grew. It is said that the head lice transformed into these monkeys.
( Source : Wikipedia )