If you have the urge to play mini-golf, paddle around a subterranean lake, go bowling and ride a Ferris wheel, this wonderland in Romania will keep you busy.
Called, Salina Turda, the defunct salt mine is located deep underground the Transylvanian countryside. Visitors enter the submerged theme park via an elevator built into centuries-old vertical shafts that used to carry miners, and are slowly transported 400 feet into the ground. It's open year-round, and aside form the above mentioned attractions, you'll also find an amphitheater, ping pong tables, basketball courts, a carousel, a spa, and a swimming pool. If you're looking for a totally unique experience, then this could be it.
[h/t: Refinery 29]