Anton_Ivanov/Shutterstock

Michelangelo wrote a poem about how much he hated painting the Sistine Chapel

One translation of the poem he sent to his friend begins:

I’ve already grown a goiter from this torture,

hunched up here like a cat in Lombardy

(or anywhere else where the stagnant water’s poison).

Doesn’t sound like he was too thrilled with his task. These are the secret messages you can find in the world’s most famous paintings.