The architectural heritage is also omnipresent in the homes of individuals and small palace officials as well as in the palace of the sovereign of Kasbah. Although some palaces and houses date back to the Middle Ages, a greater number of prestigious houses were built in the 17th, 18th, and 19th centuries such as Dar Othman (early 17th century), Dar Ben Abdallah (18th century), Dar Hussein, Dar Cherif and other houses. The main palace beys are those of La Marsa, Bardo, and Ksar Said. If we add the mosques and oratories (about 200), the madrasahs (El Bachia, Slimania, El Achouria, Bir El Ahjar, Ennakhla, etc..), The zaouias (Mahrez Sidi Sidi Ali Azouz, Sidi Abdel Kader, etc.) and Tourbet El Fellari, Tourbet Aziza Othman and Tourbet El Bey the number of monuments in Tunis approaches 600. Unlike Algiers, Palermo and Naples, its historical heart has never suffered from major natural disasters or urban radical interventions. The main conflicts and potentially destructive human behavior has been experienced in the city occurred relatively recently following the country's independence which is why it made into a World Heritage Site by UNESCO in 1979. At the beginning of the 21st century, the Medina is one of the best-preserved urban locations in the Arab world.