Swayambhunath Temple, Nepal "Monkey Temple". Swayambhunath Temple, the oldest Buddhist temple in Asia, has a history of more than 2,000 years. Some scholars believe that it is also the oldest Buddhist temple in the world, 800 years before Kathmandu. Listed in the world cultural heritage. But the environment is very beautiful compared to the dusty flying poplar in the Kathmandu metropolitan area.