The castle is the old part of the main town. It is a medieval village built to protect the people of the island from the enemies. The northern side is built on a cliff. The houses, many of which are more than ten centuries old, are still inhabited and in good condition.

Chrysospilia is a cave in the northeastern side of the island, about 30 meters above the sea, with great speleological and archaeological interest. It is 300 meters long, and has two main chambers which are connected by a small ramp. In the first chamber there used to be Roman reservoirs and numerous shells, while in the second chamber you can see impressive stalactites.

Despite the limited size of the island, there is a well preserved network of old cobblestoned streets and paths in Folegandros. The footpaths network is 20 kilometers long and runs through a big part of the countryside. These Footpaths of Cultural Interest, lead to destinations of historical, cultural or environmental importance.

This is the largest church of Folegandros, dedicated to the Assumption. It is built on a cliff above the main town, probably at the location of an Ancient Temple. In the courtyard and inside the church you will see ancient inscriptions, sculptures and bases of statues. Also, there is a marble inscription of 1687 which refers to the renovation of the temple. Reconstructions of the church as we know it today started in 1816 and ended in 1821.