Kos Island is a Dodecanese island in Greece. It is famous for its beautiful sandy beaches and its Romano-Greek architectures. The villages of Kos also have great ambiance. If you enjoy the nightlife, you will have an amazing time in Kos. Here are some amazing facts about Kos Island that you should know. The Neratzia Castle also known as Kos castle is one of the most important structures of Kos. It was built by Templars in the 14th century AD. It was named after ‘sour oranges’ which dominated the land during the period the Templars visited. Neratzia means ‘sour orange tree’. Click the next ARROW to see the next photo!