At 3718m, El Teide is the roof of the Canaries and Spain. Not only. If measured from the ocean floor (7500 m), only two mountains are more pronounced. The Guanche natives considered it the home of Guayota, their devil. Anyone traveling to Tenerife knows that old Teide is everywhere.
Between 1730 and 1736, out of nowhere, dozens of volcanoes in Lanzarote erupted successively. The massive amount of lava they released buried several villages and forced almost half of the inhabitants to emigrate. The legacy of this cataclysm is the current Martian setting of the exuberant PN Timanfaya.