Eric Vandeville-Vatican Pool/Getty Images
From England's Westminster Abbey to Egypt's Valley of Kings, to the Sistine Chapel in Vatican City, amateur photography is prohibited in some of the world's most spectacular locations, making sure these iconic and historic sites aren't overrun with selfie sticks and people posing for Snapchat stories.
But some people have been able to creep by the rule, discreetly snapping photos while security guards aren't watching.
Some of these forbidden photos have made their way to Instagram, and we picked out 37 of our favorites.