At 42 years of age, Buddha spent a summer retreat in the Tuṣita Heaven where his mother had taken rebirth. In order to repay her kindness he taught the dharma to her reincarnation. Local inhabitants built a stupa like this in Sankassa in order to commemorate this event. This stupa is characterized by having a central projection at each side containing a triple ladder or steps.
This stupa is not just a souvenir for decoration: it has been also designed for ritual purpose. Each stupa has an openable space that can be filled with proper substances by traditional way.