What to See in Sifnos
The capital of the island is called Apollonia, after its ancient patron god, and here there is an art museum. The old part is called Artemonas, and there might have been a temple dedicated to the goddess Artemis here.
Kastro is the old capital, and the Ventian citadel here dates back to the 14th century. There is a small archaeological museum here, and the village itself is well worth a visit.
Panagia Vouno, (The virgin of the Mountain) is a fascinating church that is usually open in the mornings.
The monastery of the Virgin Mary of the Golden Well (Panagia Chryso-pigi) is situated just outside Faros and is open to the public. Don't forget to wear proper clothing though. The icon of the Virgin here is said to have healing powers.