I agree with the previous comments, just wanted to emphasise the need to book the Atapuerca visits in advance, as they are popular. The first time I visited, I tried to book at the ticket counter of the museum, and there were no spaces left for the next few days. I came back the following year having booked via email. The MEH staff are very helpful, but in my experience, you will probably need to communicate with them in Spanish (eg via email or phone). I believe the visits are only in Spanish, but if you visit the museum beforehand, you can get an understanding of what you are being shown, as the exhibits there are explained in Spanish and English