Greece’s Saronic Islands (or Argo-Saronic Islands), sit just off the mainland and Peloponnese peninsula in the Aegean's Saronic Gulf. Known for their beaches and ancient ruins, they’re popular day-trip and weekend destinations. Closest to Athens is the largest island, Salamis (or Salamína), whose Ambelakia port dates to the 4th century B.C. On Aegina is the well-preserved Temple of Aphaia, built in 500 B.C.