Boudhanath Stupa is a UNESCO World Heritage Site and one of the largest stupas in the world. It is a sacred site for Tibetan Buddhists and attracts visitors from all over the world. You can walk around the stupa while turning the prayer wheels, and observe the pilgrims who come to circumambulate it. The surrounding area has many shops selling Tibetan handicrafts and souvenirs.
Swayambhunath is another UNESCO World Heritage Site and is also known as the Monkey Temple due to the many monkeys that live in the area. It is situated on a hilltop west of Kathmandu and offers stunning views of the city. The stupa is surrounded by smaller temples and shrines, and you can climb up to the top for panoramic views of the Kathmandu Valley.
Kathmandu Durbar Square is a complex of palaces, temples, and courtyards that was once the seat of the Nepalese royalty. It is another UNESCO World Heritage Site and is a fine example of Newari architecture. The square is home to several temples, including Kumari Ghar, which houses the living goddess of Nepal. You can also visit the Hanuman Dhoka Palace Museum and the Taleju Temple while in the area.
Pashupatinath Temple is a UNESCO World Heritage Site and is one of the most sacred Hindu temples in the world. It is situated on the banks of the Bagmati River and is dedicated to Lord Shiva. The temple complex has many smaller temples and shrines, and you can observe the cremation ceremonies at the ghats. The area is also home to many sadhus or holy men, who are often willing to pose for photographs.