Monolithos Castle was built in the place of another ancient castle. It is located at an altitude of about 236 meters in a meandering natural area, which made its construction a great challenge. It constitutes one of the most important fortifications in Rhodes, and today only some external parts remain, but they are in good condition. Extremely. What makes it worth climbing up the steep hill to reach the castle is the impressive churches, there are two 15th century churches of St. Panteleimon and St. George, and you can see stunning views of Mount Akramitis from there, as well as providing amazing views of the village of Monolithos and the island of Halki And of course the vast Aegean Sea.