Video: Explore theme park in a salt mine Salt is infinitely useful - from adding taste to food to keeping our roads clear of ice - yet it is all too easy to take for granted. How many of us have thought of it as beautiful? Well it is - and just look at what miners in Romania have managed to do with it. At first this video appears to be footage from the set of a long-lost Ridley Scott sci-fi film, but the vast white chambers and are in fact part of a 17th century salt mine near Cluj, Romania. Over three billion tonnes of salt were carved out by hand or machine and now the enormous void left behind has been converted into a giant underground theme park and spa. It even has its own boating lake that appears two minutes in. And why wouldn't you want to play mini-golf or receive a deep-tissue massage 400ft underground? It is when you realise they have managed to fit an entire Ferris wheel into the mine - around 2.40 minutes in - that you get some idea of how big it really is. If you are looking for something a bit different to do this weekend, then this could be it. Video courtesy of binecuvantare.ro Do you have time to watch another? Test whether your brain is left or right dominant