The Chapel of Agios Nikolaos
in Georgioupolis 

The white chapel is built on a small rocky islet, in the middle of the sea, and is dedicated to Saint Nicholas, the protector of seafarers.

You will experience a little adventure to reach the chapel, as the rocks forming the mole are a bit abnormal. 

Nevertheless, it is worth a walk there. Just don't attempt it on windy day! 

View footage of the chapel in the videos below.