The Vatican Museum

Pope Julius II founded the museums in the early 16th century. The Sistine Chapel with its ceiling decorated by Michelangelo and the Stanze della Segnatura decorated by Raphael are on the visitor route through the Vatican Museums. They were visited by 4,310,083 people in the year 2007. The Vatican Museums broke attendance records in 2011 with just over 5 million people. [Source]