How to be a good tourist & magic of the underground

As the world opens up to tourism again, we hear from one place in the world that is being visited to death, and talk about why a lot of tourism — including the "eco" kind — needs a rethink. But don't worry, we also chat to a responsible travel expert about what we can do. Then, we go underground to explore how life down there supports life up here in all manner of complex, vital and magical ways.