The trulli of Alberobello represent a dry-stone building tradition, several thousand years old, found across the Mediterranean region. The wholeness of trulli of Alberobello is visible in the number of surviving and largely original buildings (over 1,600); in the well-preserved layout of the two quarters in which the highest concentrations of trulli are found; and in the urban landscape setting of Alberobello surrounded by agricultural countryside. The principal planning document used by the Town Council of Alberobello to protect the Trulli of Alberobello is the General Housing Plan (GHP) of the Town of Alberobello (1978 with subsequent revisions). Practical guidance is provided to trullo owners in the Handbook of Trulli Restoration (Storia e Destino dei Trulli di Alberobello: Prontuario per il Restauro) (published in 1997). A 2011 Management Plan developed for the Trulli of Alberobello provides a basis for drafting a new General Urban Plan for the town of Alberobello.