No island group in Greece packs more ancient history per nautical mile than the Cyclades. At its centre lies Delos, sacred to Apollo and once forbidden to ordinary birth and death — a UNESCO World Heritage Site with no permanent population today, reachable only by boat. Around it, island after island holds its own sanctuary, ancient city, or fortified settlement. Which stops you can fit in depends on how long you have on board.

 

Delos (near Mykonos)

Delos is the centrepiece of any Cyclades archaeological route — an entire island dedicated to Apollo, uninhabited today and preserved almost as an open-air museum. The Terrace of the Lions, the Sacred Lake, the Temple of Artemis, and the mosaic floors of the House of Dionysus are among the most complete ancient remains anywhere in Greece. It’s a half-day stop in its own right, reachable by tender from an anchorage near Mykonos.

Kea (Tzia)

The closest Cycladic island to Lavrio is also home to Ancient Karthaia, one of the island’s four ancient city-states, with temple remains and over two kilometres of fortification walls still traceable on the hillside above a secluded bay — reachable on foot or, more easily, by tender from the water.

Kythnos

Vryokastro, on Kythnos, was continuously inhabited from the 10th century BC through the 7th century AD, and includes a sanctuary to Demeter — a rare window into a single settlement’s evolution across more than a thousand years.

Sifnos

Sifnos holds two distinct sites: the Mycenaean acropolis of Agios Andreas, a fortified Bronze Age settlement, and more than seventy ancient watchtowers scattered across the island — a defensive network built between the 6th and 3rd centuries BC to guard against pirates.

Syros

Kastri, above Syros’s main town, is a fortified Proto-Cycladic citadel from the 3rd millennium BC, among the oldest fortified settlements found anywhere in the Aegean.

Naxos (14 & 21-day routes)

Naxos holds two of the Cyclades’ most photographed ruins: the Portara, an unfinished 6th-century BC temple gate to Apollo that now frames the sunset from Naxos Town’s harbour, and the Temple of Demeter, an early marble temple considered an architectural forerunner to the Parthenon.

Paros (14 & 21-day routes)

The Delion Sanctuary of Apollo and Artemis crowns a hilltop on Paros, while the ancient marble quarries of Marathi — a labyrinth of underground galleries — supplied the stone for some of antiquity’s most famous sculptures, including the Venus de Milo.

Milos (14 & 21-day routes)

Milos combines a Hellenistic and Roman-era theatre carved into the hillside with the Catacombs of Milos, among the largest early Christian catacombs in Greece — and it’s the island where the Venus de Milo herself was discovered.

Santorini / Thira (21-day routes)

Akrotiri, buried and preserved by the same volcanic eruption that shaped Santorini’s caldera around 1600 BC, is often called the “Minoan Pompeii” — multi-storey buildings, frescoes and street layouts are still visible beneath the ash. Ancient Thira, on a ridge above Kamari, adds Dorian and Roman-era ruins including a theatre and agora.

Suggested Routes

  • 7 Days: Lavrio → Kea (Ancient Karthaia) → Kythnos (Vryokastro) → Syros (Kastri) → Delos & Mykonos → Sifnos (Agios Andreas) → back to Lavrio.
  • 14 Days: extends to Naxos (Portara, Temple of Demeter) and Paros (Delion Sanctuary, Marathi Quarries).
  • 21 Days: adds Milos (Ancient Theatre, Catacombs) and Santorini (Akrotiri, Ancient Thira).