The Theme: Rocks & Stones (Info was taken from Wikepedia)
Cueva de los Verdes (Spanish for "Green cave"), because in the past its owners were the "Verdes" family. It's a lava tube and tourist attraction of the Haria municipality on the island of Lanzarote, a protected area of the Canary Islands (Spain).
The cave was created around 3,000 years ago by lava flows that erupted from the nearby volcano Monte Corona, flowing across the Malpaís de la Corona towards 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 Tunnel de la Atlantida). One jameo forms the entrance to the beautiful "Cueva de los Verdes". Two kilometres of the cave system were developed for tourists in the 1960s, with the cave walls illuminated by colorful lights.
In earlier centuries, inhabitants throughout Lanzarote hid in this cave to protect themselves from pirates and slave raiders.
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