Want to know why this tank is stuck in the sand on the shores of one of Puerto Rico's most pristine beaches? Or why demon masks are so popular? And how about a massive pillar of clay and granite to mark 500 years of Columbus' discovery of the New World? All these oddities and others comprise a photo gallery called Unusual Puerto Rico. It's a compilation of some of the interesting and lesser known, or lesser visited parts of the island. Take a look ... I dare you'll find at least one or two surprising things about the island.