At first glance, it feels like summer never left. The sun beats down from a cloudless sky, and the sea sparkles with a shade of blue you usually only see in postcards.

It’s late September, but the heat lingers, holding steady at 30°C, making this the ideal Mediterranean escape when much of Europe has already started cooling off.

Found along Turkey’s scenic southwest coast, this spot has a shimmering blue lagoon and one of the country’s most…