Abandoned Romanian mine now an underground theme park

Following what it seems to be a growing trend of turning old mines into touristic attractions, a defunct salt mine in the Romanian region of Transylvania has opened as an underground amusement park, history museum and spa. After operating as a mine since the Roman Empire times until 1932, the former Turda Salt Mine (or Salina Turda) closed down to reopen for tourists in 1992. Source mining.com