Kastro is a small village located on the island of Sifnos in Greece. It is known for its traditional Cycladic architecture, featuring whitewashed houses and narrow streets. The village is situated on a hill, offering stunning views of the surrounding landscape and the Aegean Sea. The main attraction of Kastro is its well-preserved medieval fortress, which dates back to the 15th century. This historic site includes remnants of ancient walls and charming churches, making it a popular destination for visitors interested in history and culture. Kastro's serene atmosphere and picturesque scenery provide a peaceful retreat for travelers.