If you want to deface money...
Travel to: Anywhere
Punishment if caught in the U.S.: No more than six months in jail; Fined $100
If you're currently in that iconoclastic, post-teen rebellion phase and just want to burn money out of youthful angst, you may want to restrain yourself—it's illegal. While burning the American flag is protected under the clause of "symbolic protest," burning U.S. currency isn't. But if you feel like burning U.S. dollars anyway, authorities across the globe won't punish you for doing so. Not their cash, not their problem.