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There are various signs of the volcanic origin of the islands, besides the volcanic cone and craters.

Deserving special mention are sulphur grottoes, with an underground lake (Graciosa), the volcanic cones of Furnas valley (Sao Miguel), the remains of the Capelinhos volcano (Faial), the sulphur grottoes next the "caldeira de Guilherme Moniz" (Terceira), the basaltic columns of "Rocha dos Bordoes" (Flores) and the grottoes and caverns, some of them hundreds of meters long, on the islands of Sao Miguel, Santa Maria, Pico, Sao Jorge and Terceira.