Robert’s Wall (la pared de Roberto)
This photo was taken from the viewpoint at Los Andennes, where you get a spectacular view into the Caldera. From here you can see a dyke called La Pared de Roberto (Robert’s Wall). It’s about four metres high (13ft). [Volcanic dykes are formed when moulten lava fills a crack in the rock and solidifies slowly into very hard rock called basalt. Later on the softer, surrounding rock is eroded…