The chapel of Aghios Ioannis Kastri is on the top of a sea rock at a height of 100 m. There is no record of when it was actually built.

Local history says that a resident saw a glow on the top of the rock one evening, at first he did not give particular significance to this, but it was repeated many times and then in a dream he saw a woman who told him to go to the top of the rock with the other residents and search for an icon there, and so there was. The next day the whole community of the island there and he related what had happened. Then they all began to carve steps into the rock to the top. Once there they found the Aghios Ioannis icon, which was transported to a nearby chapel. The next day they discovered that the icon was not in the church, but back where it had originally been found. They decided to build a chapel on the site to house the icon because they believed that the saint wished to be there. There are 105 steps carved into the rock leading to the chapel.