Kythera

Kythera  is an island in Greece, once part of the Ionian Islands.It lies opposite the south-eastern tip of the Peloponnese peninsula.

 
       Pavlopetri 

     The city of Pavlopetri (Greek: Παυλοπέτρι), underwater off the coast of southern Laconia in Peloponnese, Greece, is about 5,000 years old, and is the oldest submerged archeological town site and is located between the Pavlopetri islet across the Elafonisos island and the Punta coast.