④⑨,000 year old Neanderthal bones have been discovered by chance in a remote, mountainous region of Northern Spain. The bones may help solve the biggest Neanderthal puzzle of all – why we are here today and Neanderthals are not.④⑨,000 year old Neanderthal bones have been discovered by chance in a remote, mountainous region of Northern Spain. The bones may help solve the biggest Neanderthal puzzle of all – why we are here today and Neanderthals are not.