Shadiyakh or Shadyakh (in Persian: شادیاخ, a contracted form of شادی کاخ, Shadi-Kakh meams Palace of Happiness) was one of the main Palaces,Gardans and Great Neighborhood of old Nishapur that established by Abdullah ibn Tahir al-Khurasani up to the 9th century AD, which became more important and populated after that. Some notable people like Attar lived there. Attar's tomb is nowadays in that area. This palace was perhaps completely ruined in 13th century AD.
Now Shadyakh Is national Iranian monuments, and its registration number is 10910.
Excavations began in 2000 there and continued for around 2 years: buildings (possibly a palace), skeleton, equipments and other items were found there.