Cueva de los Verdes

Step down out of the sunlight and feel the air change. Within a few paces, the heat of Lanzarote falls away. The air turns cool, still, and slightly damp. Underfoot, the path is uneven, and the walls close in on either side. Soft amber lights glow low along the rock. Somewhere ahead, voices fade into a muffled hush. You are now walking inside a volcano's old plumbing, a tunnel that molten rock carved through this island thousands of years ago.

This is the Cueva de los Verdes, in the north of Lanzarote, in the municipality of Haría. It is not a cave in the usual sense. Water did not dig it, and no river ever ran here. It is a lava tube. When the volcano called Monte Corona erupted, several thousand years ago, rivers of lava flowed down towards the sea. The outer skin of those rivers cooled and hardened into a crust. Beneath it, the hot lava kept flowing.

When the eruption ended, the liquid lava drained away. It left behind a long, hollow tunnel of solid rock. That is the space around you now. The whole tube runs for more than six kilometres, from the slopes of Monte Corona down to the coast. It does not stop at the shoreline either. Part of it continues under the Atlantic Ocean, in flooded passages that divers have explored. Only a small section is open to visitors.

On the surface above you lies the Malpaís de la Corona. Malpaís means bad land in Spanish, and the name fits. It is a rough, black field of broken lava, difficult to cross on foot. Along the line of the tube, the roof has collapsed in places. Locals call these openings jameos. A jameo is simply a hole where the ceiling of a lava tube fell in. You entered the cave through one of them.

Now, the name. Many visitors assume that Verdes means green, and they look for green rock or green light. You will not find much of either. The cave takes its name from a family. The Verdes were a local family who kept goats on this land, and they used the cave. Over time, the place simply became known as the cave of the Verdes. It is a small, human name for a vast geological structure.

The cave also carries a darker story. For centuries, the Canary Islands were exposed to raids from the sea. Pirates and slave raiders landed on Lanzarote again and again, especially in the sixteenth and seventeenth centuries. People were captured and taken away. When raiders came, islanders fled into this tunnel and hid in the dark. The narrow passages and hidden levels made it a good refuge. Imagine families waiting here in silence, listening for footsteps.

Look closely at the walls as you walk. The rock is not one colour. You will see black basalt, but also deep reds, rusty oranges, and pale ochre. Those warm colours come from iron and other minerals in the lava, changed by heat and air. In some places, the surface is smooth and glassy. In others, it is rough and bubbled, where gas escaped from the cooling rock. Each texture is a record of how the lava moved.

Notice the ceiling too. In parts of the tunnel, you will have to bend low. In other parts, the roof rises high above you into darkness. The cave has more than one level. As the lava flowed, new crusts formed inside the tube, creating galleries stacked one above another. Your route moves between these levels. Watch for the lines along the walls. They mark old lava levels, like tide marks left by a liquid that is now stone.

The cave opened to the public in the 1960s. The lighting was designed with care by the artist Jesús Soto, who worked with the island's tourism projects in that period. Those projects were shaped by César Manrique, the Lanzarote artist who believed that tourism should respect the landscape. Here, the idea was simple. Do not flood the cave with harsh white light. Use low, warm lamps that show the forms of the rock and leave the shadows in place.

At one point, the tunnel opens into a wide chamber with rows of seats. This is a natural auditorium, and concerts have been held here. The rock walls give the sound a deep, rounded quality. If your group pauses, listen. Even a quiet voice carries. Music played in this space bounces between basalt surfaces that no architect planned. It is one of the more unusual concert halls you are likely to sit in.

Visits here run as guided tours, in small groups that move together through the tunnel. Stay close to your guide, because the light is low and the ground is uneven. Near the end of the route, your guide will show you something unexpected. It is a surprise that guides ask visitors to keep to themselves. So we will not spoil it here. Just watch carefully, and trust your eyes a little less than usual.

After the tour, it is worth remembering that this tunnel connects to another famous site nearby. Further down the same lava tube, closer to the sea, lies Jameos del Agua. There, Manrique turned another collapsed section into a space with a saltwater lagoon, gardens, and a concert hall. It is the same volcanic tunnel, but with a very different mood. Seeing both helps you understand how long and how varied this one structure is.

Before you climb back into the daylight, stop for a moment. Feel the cool air on your skin. Look at the dark rock and the soft circles of light. Above you, people are driving along the road and wind is crossing the black fields. Down here, the stone has not moved for thousands of years. When you step outside again, look at the rough lava around the entrance. Under that ground, the tunnel keeps running towards the sea.