A UNESCO World Heritage Site, Aldabra is the world's largest raised coral atoll. It has a thriving ecosystem and central lagoon fills and empties twice a day. Visitors can see amazing creatures like tiger sharks and manta rays in the shallow waters. Aldabra is home of more than 200.000 giant tortoises – a 5 times larger population than on famous Galapagos. Make sure to arrange permission in advance to visit this magnificent place.