Thieves broke into the Louvre in Paris — the world's most visited museum — early Sunday morning. Museum officials said they stole jewelry and fled.

Find out how the Louvre's daring daylight heist is changing museum security and what every traveler should know before visiting major attractions.

Days after eight pieces of the French crown jewels were stolen from the Louvre, a former bank robber who once toured the now-infamous Apollo Gallery for a Louvre podcast says he warned a museum official of weaknesses in security.