Playa del Amor, commonly known as the Hidden Beach, is a feature of one of the Marieta Islands, located some 22 nautical miles west of Puerto Vallarta, Mexico, at the mouth of Banderas Bay. It looks like something out of a fantasy novel: a wide, sandy cavern with the blue waters of the Pacific rushing in. The Marieta Islands is a group of uninhabited islands formed by underwater volcano eruptions. They are natural wonders, but it was something other than the volcanic activity that brought the burrowed beach to light.