La Gruta de las Maravillas, since accessible to the public in 1914, a popular trip place became for tourists today. Every year, approximately 150.000 people visit these grottos. This beautiful and impressive one became thanks to the initiative of the marquis of Aracena and the Mayor Juan del Cid "cave of the miracles "beginning of the 20 century to the tourist area explains.

This formation refined to beautiful hills that appear palace similarly, approximately 11 million years ago. Through erosion and irrigation of the rock through water, these grottos acting as gem, that run across several floors and many areas, refined over year millions away. Crystal-clear source water and the effect of the light let the impression originate, one was amidst of gigantic gems. In the year 1911, the performances began to do accessible to visitors around the grottos, that continued until 1914.

There are not clear indications at the discovery of the caves. For the first time, it was reported in the year 1886 about these caves. In writing of this, the mining and the geological situation are described mine's engineers González and Tarín. In old stories, one hears, that it is supposed to have it a shepherd the grottos discovered as he looked for a lost sheep and found the entrance so.