Algar do Cavao

If you've ever wanted to step inside a real volcano, Algar do Carvao on Terceira Island in the Azores is your chance. This isn't your typical lava cave, it's a volcanic chimney, where you can actually walk down into the Earth's core (well, almost). Expect towering rock walls covered in moss, surreal volcanic formations, and even a crystal-clear underground lake at the bottom. It's like a scene straight out of a fantasy movie! What Makes It Special? You're Inside a Dormant Volcano: Unlike other caves, this one wasn't formed by flowing lava but by a volcanic eruption over 3,000 years ago. The lava drained away, leaving behind this massive underground chamber. The Underground Lake: At the very bottom, there's a rain-fed lake, and depending on recent rainfall, its depth changes. The reflection of light on the water makes it even more magical. Lush Green Walls: Over time, nature has taken over, covering the rocky interior with vibrant moss and ferns, giving the whole place an almost otherworldly vibe.

Tips for Visiting

Wear Good Shoes: The stairs leading down are steep and can be slippery, so bring sturdy, non-slip shoes. Flip-flops? Big mistake.
It:s Cool Down There: Even on a warm day, the temperature inside stays around 15C (59F). Bring a light jacket, or be prepared for goosebumps!
Check the Opening Times: Algar do Carvao isn't open every day, and right now, it's temporarily closed for renovations (reopening expected in March or April 2025). Always check ahead!
Don't Skip the Nearby Lava Caves: If you're into cool geological wonders, add Gruta do Natal to your itinerary. It's a lava tube with a very different feel but just as interesting.