The Baptistery of Saint John dates back to the 11th century and is one of the most sacred buildings in Florence, Italy. A major project is working to restore the millions of tiles on the chapel's ceilings. The process even remains open to the public. Dana Jacobson has more.

"CBS Saturday Morning" co-hosts Jeff Glor, Michelle Miller and Dana Jacobson deliver two hours of original reporting and breaking news, as well as profiles of leading figures in culture and the arts. Watch "CBS Saturday Morning" at 7 a.m. ET on CBS and 8 a.m. ET on the CBS News app.

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