Mljet claims to be the most beautiful island in the Adriatic. Pictures of the island do little to disprove that claim. It’s the greenest of the Croatian islands. A national park makes up much of Mljet, but, outside the park, you’ll find quaint, tiny villages on this sparsely populated island. The island has two saltwater lakes that have islands. On one you’ll find an old Benedictine monastery dedicated to St. Mary. Odysseus, a Greek king who was the hero in Homer’s Iliad reportedly lived here for seven years; today, you can enjoy a visit to his cave/grotto.