According to the article

The tiny island of Sifnos, one of Greece’s Cyclades Islands, is a world away from the bustling cruise ship and tourist scene in neighboring Santorini. The white-washed villages and quaint churches against the backdrop of the Aegean’s stunning blue waters is the essence of Greek charm. It’s a perfect place to appreciate slow rhythm of Mediterranean life.

Like Sifnos, the island of Milos is part of the Cyclades island chain, but it stands out for its unique and gorgeous landscapes. The island owes its stunning rock formations to its volcanic origins, and is home to towering cliffs which shelter hidden coves of calm sapphire water. One of the most spectacular ones is Sarakiniko Beach, formed of radiant and wind-smoothed white rock which stands in bright contrast to the emerald waters.