The Prinkipo Greek Orphanage (Turkish: Prinkipo Rum Yetimhanesi, also known as Prinkipo Palace or Büyükada Greek Orphanage) is a historic 20,000-square-meter wooden building on Büyükada, one of the nine Princes’ Islands off the coast of Istanbul, Turkey, in the Sea of Marmara. It is considered the largest wooden building in Europe and second largest in the world. It served as an orphanage from 1903 to 1964.