Buddhism is equally popular in Nepal and so are Buddhist pilgrimage sites.There are Buddhists all over Nepal and hence Buddhist monuments are all over Nepal.In Kathmandu valley we have 2000 years old impressive stupa of Swoyambhunath and world's biggest stupa at Bouddhanath.The Bouddhanath stupa is 1500 years old and is more popular among the many Tibetan refugees living in Kathmandu .Inside the Kathmandu valley the city of Patan is dominantly Buddhists and has places like Mahabouddha Temple and Hiranya Varna Mahavihar to show you.On the outskirt of Kathmandu in the hill is the stupa of Namobuddha, small but old, active and highly revered.
