Prepare to be awe-struck by this masterpiece, sculpted over eons by nature's own hand. With stalactites that sparkle in the dark and 'dwarf stalagmites', it's one of the most stunning caves in Europe. It also tells a very old story: Here, hidden among the stalagmites, the 700,000-year-old skull of an early human (Archanthrapus) was discovered. Aged 30-35 years, he was considered elderly for that time.