Cueva de los Verdes is a lava tube and tourist attraction in the Haria municipality on the island of Lanzarote.
The literal translation of 'Cueva de los Verdes' is 'Green's Cave' - because it was inhabited for a long time by the Green family.
The cave was created around 3,000 years ago by lava flows erupted from the nearby volcano Monte Corona, flowing across the Malpaís de la Corona toward the sea.
The lava streams cooled on top, developing a solid crust, before the lava drained away leaving the top part as the roof of a cave.
In about 20 spots, the roof of the cave collapsed, forming a cavern known locally as a jameo.
The caves extend for 6 kilometres (3.7 mi) above sea level and for another 1.5 kilometres (0.93 mi) below the sea.
The lower half of the above image is a reflection.