Algar do Carvão is a cool volcanic cave on Terceira Island in the Azores, Portugal. It's like a vertical well made of basalt rock, with a 100-meter length and a 90-meter depth. People first explored it back in 1893, and now you can take tours to check out its unique stalactites and underground pool. Plus, it's home to some funky plants and critters that add to its mysterious vibe. So, if you're into caves and lava tubes, this place is definitely worth a visit!

Algar do Carvão is one of the few places in the world where you can walk directly into the heart of an ancient volcano. This remarkable volcanic chimney descends more than 90 meters underground, revealing a cathedral-like lava tube lined with stalactites, mineral formations, and moss-covered walls. It offers a rare opportunity to explore the inside of the Earth without specialized equipment.

Why Visit:

• Enter the vertical shaft of an extinct volcano

• Explore the only volcanic chimney open to the public in the Azores

• Witness geological formations shaped by fire, water, and time

Interesting Facts:

• The name "Algar do Carvão" means "coal pit," though it was never a coal mine. The name refers to the dark volcanic rock.

• Discovered in the 19th century but only accessible to the public after infrastructure improvements in the 20th century

• Declared a Regional Natural Monument and part of Terceira’s protected natural heritage

Access:

• Accessible by car; small parking area available

• Entry requires a ticket, and the cave is only open seasonally (typically spring to fall)

• Guided visits are recommended to fully appreciate the geological context

Insider Tip: Don’t forget to look up: the skylight at the top of the chimney allows light to stream down dramatically onto the cave walls. If you have a drone and permission, aerial footage from above the chimney's mouth is breathtaking — but even handheld shots from the entrance staircase are impressive due to the natural lighting and depth.

⚠️ Currently closed for restoration works since October 20, 2024. Reopening is expected around April 2026.

Follow updates via the official source: https://www.montanheiros.com/algarcarvao/

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Some of the stunning photos featured in this guide were generously shared by Bruno Ázera, an incredible photographer and local from Terceira Island. Make sure to follow him on Instagram! And if you're looking to dive deeper into the best photo locations across the Azores, he has an outstanding photo guide to the archipelago, available at the following link.