Neil Kreeger
Section editor
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The Sete Citades crater, the Azores The impressive Sete Citades crater is located to the west of the island of São Miguel. © Bruno Perousse
Here, the sea reveals the caldeiras of Achada das Furnas, a type of rocky formation formed by volcanoes, which offer a fabulous walk into the caves that give off a mystical aura with its clouds of evaporating steam. The hot springs are used for spa purposes at the prominent health centres of Furnas.