The longest known lava tube in Portugal, formed by the Mistérios Negros eruption around 1,500 years ago and running for roughly 5 kilometers, of which a section is open on guided walks fitted with helmets and headlamps. Basalt formations and lava-flow textures line the tunnel walls.
Gruta das Torres is the longest known lava tube in Portugal, formed by the Mistérios Negros eruption around 1,500 years ago on Pico Island and running for roughly 5 kilometers, of which a maintained section is opened to visitors on guided walks. Guides provide helmets and headlamps before leading small groups through a tunnel lined with basalt formations, lava-flow textures, and in places, lava stalactites formed as the tube's roof cooled. The accessible section takes 45 minutes to an hour to walk, moving over an uneven natural floor that includes some low clearances and short scrambles. Tour departures run through the day, typically between 10AM and 2:30PM, though the current schedule should be checked locally since it can shift seasonally. Because groups are kept small to protect the cave environment and manage safety underground, booking the first departure of the day generally means a smaller group and a more personal tour.
| Admission | Adult Approx €8 (approx $8.65) · Child Reduced rate, verify current pricing locally |
|---|---|
| Hours | Guided tour departures typically 10AM-2:30PM; verify current schedule locally |
| Typical visit | 45 minutes-1 hour (guided) |
| Best time | Book the first departure of the day for the smallest group size |
| Getting there | Rental car, about 15 minutes from Madalena |
| Address | Criação Velha, 9950 Madalena, Pico, Azores, Portugal |
Location
Criação Velha, 9950 Madalena, Pico, Azores, Portugal
38.5375, -28.4864 View on map
Highlights
- Portugal's longest known lava tube, roughly 5 km overall
- Guided walk through basalt formations and lava-flow textures
- Helmets and headlamps provided for the underground route
- Formed by the Mistérios Negros eruption around 1,500 years ago
Tips for visiting
- Book the first departure of the day for the smallest group size
- Wear closed shoes and clothing that can get dusty on the tunnel floor
- Some sections require ducking or short scrambles, so mobility is needed
- Confirm the current tour schedule locally, since departure times can shift
When to visit
Book the first departure of the day for the smallest group size.
Accessibility
The lava tube has an uneven natural floor with low clearances in places, making it inaccessible to wheelchairs and difficult for visitors with limited mobility.
Frequently asked questions
How long does a visit take?
The guided tour of the accessible section takes 45 minutes to an hour.
Is it worth it for kids?
Yes for older children able to manage low clearances and uneven ground; it may be difficult for very young children.
Is photography allowed?
Yes, though low light underground makes a flash or steady grip useful.