The Castle of Chora is located northeast of Chora settlement and it was built in the 11th AD century and was repaired by the Knights of St. John in the late 15th century.
Till the early of 18th century the Castle of Chora was the residential centre of Kalymnos. In the Castle of Chora there are ten churches still preserved and their interior still shows wall paintings from the end of 15th - early 16th century.