Sneaking into North Korea has proved to be a powerful temptation for some Americans. Some were driven by religious zeal, others simply were attracted by the mystery of a remote and cloistered country that seems the polar opposite of anything they had experienced.

North Korea says it is expelling American Bruce Byron Lowrance after he slipped unlawfully into the police state known for its anti-U.S. fervor.

 A look at some of the Americans who have entered North Korea in past decades: