If your trip to Cartes is all locked in but your itinerary is a little on the empty side, we can give you a few hints and tips.There's nothing more enjoyable than visiting new places. While you're in the area, Caves of Altamira and Santillana del Mar Zoo should be among them. If you still have loads of energy and room on that itinerary, Collegiate Church of Santillana del Mar also awaits.