Kastro, Sifnos
Written by Elena Philippou,Updated June 2026
The medieval former capital, built on a cliff above the sea.
Kastro is the oldest and most atmospheric village on Sifnos — the island's capital for centuries, set on a rocky headland on the east coast. Its houses are built into one another to form a defensive ring, with Venetian-era coats of arms still set above some doorways and the Aegean falling away on three sides. It's a place to wander slowly rather than tick off sights.
A village built as a fortress
Kastro was settled in antiquity and served as the capital of Sifnos through the medieval and Venetian periods. The outer houses form a near-continuous wall, their backs to the sea, with narrow covered passages threading between them. Marble fragments and old crests are built into the lanes — the village is, in effect, a living archaeological site you can walk through.
The walk & the views
A loop around the outer edge takes maybe twenty minutes and gives you the village's best views — whitewashed houses above sheer rock, and the small church of the Eptamartyres (Seven Martyrs) sitting alone on a rock just offshore, one of the most photographed spots on Sifnos. There's a small archaeological museum in the village too.
Seralia beach below
A steep path and a short road lead down from Kastro to Seralia, the village's little harbour beach — a sheltered cove with tavernas right on the water. It's a good place to swim and eat after exploring the lanes above.
Kastro & the villa
Kastro is on the far side of the island from Platis Gialos — roughly 15–20 minutes by car. It makes an easy half-day from the villa, best in the late afternoon when the light is soft and the day-trippers have thinned. Pair it with dinner in nearby Apollonia on the way back.
Kastro, Sifnos — common questions
What is Kastro in Sifnos?
Kastro is the medieval former capital of Sifnos, a fortified village built on a cliff on the east coast, with Venetian-era walls, narrow covered lanes and white chapels above the sea.
Is Kastro worth visiting in Sifnos?
Yes — it's the island's most atmospheric village, with the best sea views, the iconic Eptamartyres chapel on its rock, and a small archaeological museum. Late afternoon is the nicest time to walk it.
Is there a beach at Kastro?
Yes — Seralia, the village's small harbour beach, sits just below Kastro, a short walk or drive down, with tavernas on the water.
How far is Kastro from Platis Gialos?
About 15–20 minutes by car. It makes an easy half-day trip from the villa, often paired with dinner in Apollonia.
Explore Kastro from the villa
Villa Olivia Clara, above Platis Gialos, is an easy drive from Kastro and the rest of the island. Tell Elena your dates and she'll help you plan the days, villages and beaches.