A World Heritage site is a site that is considered to be there for all of humanity not just the people by it. UNESCO's goal is to preserve and protect these sites for future generations of the world.
Italy has many sites on the list. I was surprised to see that only 3 were considered "natural" sites. The Dolomites are a mountain range in Northern Italy. The mountain range is a World Heritage site because it is considered one of the most beautiful mountain ranges in the world. The Dolomites also play a great significance to geomorphology, which is the study of how land forms are made and changing throughout time.
Another site is The Church and Dominican Convent of Santa Maria delle Grazie. This church is important because it houses Leonardo da Vinci's famous painting, "The Last Supper." This painting is famous worldwide and was even featured in the movie, "The Da Vinci Code."