Vanuatu’s blue holes must be seen to be believed. Flashing sapphire amid the lush jungle, the swimming holes seem too perfect to be natural. Many are the product of freshwater springs trickling from the belly of the islands’ mountains, while some oscillate with the tide, filling with fish that dart in their crystal depths like wondrous, native aquariums. The pools range in accessibility through the islands, some almost feeling like your own private outdoor spa, a world away from the hustle and bustle of modern life. Don’t forget to take some cash with you, there’s often an entrance fee that helps cover the amenities provided by the local owners.