[5] There is no universal principle of design in Zoroastrian religious architecture; as a result, each pir has its own unique structures and features.
To these trees are sometimes tied wish-ribbons, a form of decorative, occasionally highly complex, textile garlands.
Traditionally, pilgrims would spend three days at pirs before departing;[1] however, in modern times this practice has declined.
[9] The only exception to this is in Pir-e Sabz, where it is still common for worshippers to remain near the site from June 15 to 18, the traditional dates of pilgrimage.
[9] In Vancouver, the Zoroastrian community annually gathers in a specific spot in the mountains on June 13 and practices the rituals and traditions that they would be enacting were they able to travel to Pir-e Sabz itself.