According to the United National Educational Scientific and Cultural Organization (UNESCO) two third of the world’s historical artistic heritage is in Italy.

WORLD HERITAGE SITES IN ITALY
 
According to the United National Educational Scientific and Cultural Organization (UNESCO) two third of the world's historical artistic heritage is in Italy. Tuscany for example boasts by itself more artistic treasures than the entire Spain which is at the second position in the list of world heritage. We can confirm that all the most important styles of Western architecture can be found in the Italian peninsula.
 

If you are interested in receiving more information about the world's historical artistic heritage please visit the UNESCO World Heritage Centre website at the address http://whc.unesco.org. Here below you can instead find the list of Italian World Heritage Sites declared by UNESCO:

ITALIAN WORLD HERITAGE SITES LIST 
 
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1980,90

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1982
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Rock Drawings in Valcamonica (Lombardy)
Historic Centre of Rome, the properties of the Holy See in that city enjoying extraterritorial rights, and San Paolo fuori le Mura (Latium)
Church and Dominican Convent of Santa Maria delle Grazie with "The Last Supper" by Leonardo da Vinci - Milano (Lombardy)
Historic Centre of Florence (Tuscany)
Venice and its Lagoon (Veneto)
Piazza del Duomo - Pisa (Tuscany)
Historic Centre of San Gimignano (Siena, Tuscany)
The Sassi and the Park of the Rupestrian Churces of Matera (Basilicata)
The City of Vicenza and the Palladian Villas (Veneto)
Historic Centre of Siena (Tuscany)
Historic Centre of Naples (Campania)
Crespi d'Adda - Capriate (Lombardy)
Ferrara, City of the Renaissance and its Po Delta (Emilia-Romagna)
Castel del Monte - Bari (Apulia)
The Trulli of Alberobello - Bari (Apulia)
The Early Christian Monuments and Mosaics of Ravenna (Emilia-Romagna)
The Historic Centre of the City of Pienza (Siena, Tuscany)
The 18th-Century Royal Palace at Caserta with the Park, the Aqueduct of Vanvitelli, and the San Leucio Complex (Campania)
The Residences of the Royal House of Savoia (Piedmont)
The Botanical Garden, Orto Botanico - Padua (Veneto)
The Cathedral, Torre Civica and Piazza Grande - Modena (Emilia-Romagna)
The Archaeological Areas of Pompei, Ercolano, and Torre Annunziata (Naples, Campania)
Villa Romana del Casale - Piazza Armerina (Enna, Sicily)
Su Nuraxi di Barumini, Cagliari (Sardinia)
Portovenere, Cinque Terre, the Islands (Palmaria, Tino, Tinetto - Liguria)
The Amalfi Coast, Costiera Amalfitana - Salerno (Campania)
The Archaeological Area of Agrigento (Sicily)
Cilento and Vallo di Adriano National Park with the Archeological sites of Paestum and Velia, and the Certosa di Padula (Salerno, Campania)
Archaeological Area and the Basilica of Aquileia (Udine, Friuli)
Historic Centre of Urbino (Marches)
Villa Adriana (Tivoli - Latium)
City of Verona (Veneto)
Isole Eolie (Aeolian Islands, Sicily)
Assisi, the Basilica of San Francesco and Other Franciscan Sites (Umbria)
Villa d'Este, Tivoli (Latium)
Late Baroque Towns of the Val di Noto (South-eastern Sicily)
Sacri Monti of Piedmont and Lombardy
Val d'Orcia (Tuscany)
Etruscan Necropolises of Cerveteri and Tarquinia (Latium)
Syracuse and the Rocky Necropolis of Pantalica (Sicily)
Genoa: Le Strade Nuove and the system of the Palazzi dei Rolli (Liguria)
Mantua and Sabbioneta (Lombardy)
Rhaetian Railway in the Albula / Bernina Cultural Landscape (Switzerland and Italy)