A 100‑kilogram, 99.999 percent pure gold coin nicknamed the “Big Maple Leaf,” worth more than $4 million in bullion despite a $1 million face value, vanished from Berlin’s Bode Museum during a 3 a.m. heist on March 27, 2017. Four men went to prison, but the coin was never recovered, making it one of the most audacious unsolved thefts in modern history.