The Dhando Chaitya is considered the oldest stupa (reliquary) in the Kathmandu Valley. Oddly, none of the websites actually say how old it is, but it was said to have been built by the daughter of Emperor Ashoka of India.
Despite its status, it sits in the commercial Chabadil neighborhood, far from the tourist sites in Thamel. The gate to the temple grounds was locked, so all I could do was walk around and take photographs of the site and the vendors outside.
COHN17 