Santorini, Greece. circa 1975

Santorini, also known as Thira or Thera, is a beautiful Greek island. Santorini is the southernmost of the major Cyclades islands in the Aegean Sea, the closest one to Crete. This is one of the most-visited Greek islands, for good reason.
Thera or really Θηρα is the Greek name. The name Santorini dates from its Italian language name, "Saint Irene", as the island was seized by the Venetians in the 1200s AD after the Fourth Crusade had sacked Constantinople and overthrown the declining Byzantine Empire.
Santorini was a conical volcano forming a roughly circular island 15 to 20 kilometres in diameter. The volcano exploded some time around 1600 BC in one of the largest volcanic events in history. It is now estimated that about 100 cubic kilometres of magma and rock were expelled.