The value of the "Mona Lisa" is said to be more than $1 billion, although many experts contend that this work of art is invaluable. Painted by artist Leonardo da Vinci in 1503, the oil-on-wood painting is housed in the Louvre in Paris.
The "Mona Lisa" is thought to be the greatest treasure of the Renaissance art movement. The portrait's subject, Lisa Gherardini, was the wife of a wealthy silk merchant from Florence. Leonardo da Vinci spent almost 20 years perfecting the piece of art and obsessing over the position of Lisa's hands.
Mona Lisa is called La Jaconde in France and La Gioconda in Italy. At the Louvre, the painting is safely housed behind non-reflective glass in a temperature-controlled security box.