Formed over 20,000 years ago from the eruption of the Corona Volcano in northern Lanzarote, this impressive tube stretches approximately 4.7 miles, with nearly a mile submerged underwater.

Cueva de los Verdes, which means "Cave of the Greens" is known for its captivating shapes and vibrant colours, beautifully formed in the volcanic rock. Some say that the "Green" refers to the ...