At Castle location, there are two fortification enclosure since the Historical Ages.
At the following locations Symi, Pedi, Panormitis, exist relics or traces of paleochristian basilicas
At the location of Nimporios ashes of paleochristian basilica can be found. In addition, there are architectural parts made of marble (second hand) in the little churches of the surrounding area.
In Gialos you may find the statue of the little fisherman Michalakis.