Discover the Secrets of the Islands

Practical guides, tested itineraries and updated information to plan your trip to the Azores and Madeira. Written by those who know the islands inside out.

View from the bottom up of the Algar do Carvão opening, with walls covered in green ferns and moss, and the sky visible at the end, on Terceira Island, Azores

Terceira | Caves | Nature

6 Mar 2026

Algar do Carvão and Gruta do Natal: What to know before you visit

Descend 90 meters into the interior of an extinct volcano and explore one of the most impressive geological wonders of the Azores. Discover stalactites, underground lagoons, and rock formations millions of years old.