User: Hey! can you suggest me some attractions there, which is child-friendly? If there is any Historical Landmark without an entry fee, it would be great.
Assistant: Yup, there are some 5 attractions that suits your requirement. There is a Historical Landmark named Catacombs of Paris, an underground ossuaries in Paris, France, which hold the remains of more than six million people in a small part of a tunnel network built to consolidate Paris' ancient stone mines.