Hidden details found in art's great masterpieces

(CNN)It's easy to take a well-known masterpiece at face value.

However, many of the world's most renowned works come loaded with underlying messages and back stories. Artists use specialized techniques and subtle symbolism to hint at larger themes, expand on a narrative or -- in some cases -- add a touch of humor.
"Art in Detail: 100 Masterpieces," written by Susie Hodge, sets out to illuminate the obscure details that the average passerby is likely to miss as they flit between the galleries at the world's most prestigious art institutions.
"Looking at any work of art is a personal experience," Hodge writes, "but one that always benefits from a wider knowledge and awareness. The more you know and the closer you look, the more you will see and enjoy."
Check out the gallery above for a closer look at some of history's most groundbreaking masterpieces.
"Art in Detail: 100 Masterpieces" by Susie Hodge, published by Thames & Hudson, is out now.