Giyali island is to be found nestled just underneath the Greek isle of Kos in the Aegean sea. The island is volcanic and is one of the many Dodecanese islands. The western side of the island is almost totally made of pumice stone while the rest is obsidian lava giving this island a brilliant white appearance and a unique landscape. The only way to get to this 6-kilometre long island is by boat and from an offshore position, you can see the step-like formations of the Pumice stone mines. Another Greek Mediterranean island located nearby Nisyros and Lambi Beach are also well worth a visit.