Lagoa das Sete Cidades, in the island os São Miguel, in the Azores, Portugal, is one of the most beautiful places on Earth! 😀
The islands of Azores are of vulcanic formation, the reason behind the strong greens and of thermal waters and large calderas (the remains of the vulcano's interior).
If you haven't visited Azores, we STRONGLY advice you to do it! 😉