1. Altamira Caves

Although this site is a short drive out of the city, it is highly recommended by locals and by the tourist office. Guided visits are the best way to see the cave, which is full of prehistoric paintings and engravings. Archeological remains were also found in the cave, including ancient tools made from bones. To see the inside of the cave, visitors must apply in writing or by fax at the Altamira Museum – but the amazing, vivid Stone Age paintings on the ceiling are worth the effort.   (© 10Best)

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