Kathmandu Durbar Square:
The home of the UNESCO world heritage sites, Kathmandu also known as Kantipur is the capital of Nepal and Kathmandu Durbar Square was the palace. Here you’ll find ‘The Living Goddess’ acknowledging the greetings of devotees from the balcony of her temple residence; Durbar Square with an array of temples overlooked by the Hanuman Dhoka Palace, with its sitting place called Kasthamandap (from which the name Kathmandu was derived). It is said that Kasthamandap was made from the timber of a single tree. This whole area reflects the ancient place of the Nepalese Royalty.
Swayambhunath: 
UNESCO world heritage site: Swyambhunath is located approx. 4 km/2.5 miles away from the center of the city lays this Buddhist stupa which is said to be 2000 years old. The stupa which forms the main structure of this stupa is composed of a solid hemisphere of bricks and earth supporting a lofty conical spire capped by a pinnacle of copper gilt. Painted on the four-sided base of the spire are the all-seeing eyes of Lord Buddha. This hill demonstrates the mosaic arts of small Chaityas and Pagoda temples.
Pashupatinath: 
UNESCO world heritage site Situated 5 km east of the center of Kathmandu. Pashupatinath temple is one of the holiest temples dedicated to the Hindu Lord Shiva. Located amidst a lush green natural setting on the bank of the sacred Bagmati river, the temple built in pagoda style has a tilted roof and richly carved silver doors. Visitors will be permitted to view the temple from the east bank of Bagmati river, as the entrance into the temple is strictly forbidden to all non-Hindus. Pashupatinath is the center of an annual pilgrimage on the day of Shivaratri which falls in the month of February/March. Behind the temple is the cremation ground that many Hindus in Kathmandu chose for their funeral ceremony.

UNESCO world heritage site
Boudhanath stupa located 8 km east of Kathmandu city is one of the biggest stupas in the world. It stands with four pairs of eyes in the four cardinal direction keeping watch for righteous behavior and human prosperity. This Buddhist stupa was built by King Man Deva at the advice of the Goddess Mani Jogini. It is built on an octagonal base inset with prayer wheels. The shrine is ringed by houses of Lamas or Buddhist priest.
UNESCO world heritage site, this ancient city of Patan also known as Lalitpur or the city of fine arts is about five kilometers southeast of Kathmandu. The city is full of Hindu temples and Buddhist monuments. The major tourist attractions of Patan are:
Patan Durbar Square, situated in the heart of the city, is the main focus and visitor's attraction. The square is full of ancient palaces, temples and shrines, noted for their exquisite carvings. The Patan Durbar square consists of three main chowks or courtyards, the central Mul Chowk, Sundari Chowk, and Keshav Narayan Chowk. The Sundari Chowk holds in its center a masterpiece of stone architecture, the Royal bath called Tushahity.