Among the many UNESCO World Heritage Sites across the planet, this is definitely one of the most unique, as well as the most ancient, since it largely consists of a pristine rainforest that was undisturbed for millennia. There are many uniquely endemic and endangered species to be seen here, such as the Seychelles Black Parrot, of which there are only less than a thousand left in the world. The hallmark of Vallée de Mai, however, has to be the Coco de Mer, which is a unique species of coconut tree that produces double-coconuts, with some weighing as much as forty-five kilograms.