[Blue cave]paul prescott/Shutterstock Most people know the big-name European cities and landmarks. But travel should be more than crossing items off a bucket list. Did you know there is a Greek island where you can climb inside of an active volcano? Or a natural cave in Croatia that is so blue it looks fake? Probably not. That is why we have compiled a comprehensive list of such little-known yet spectacular places worth visiting in Europe. From quiet cities and tiny villages to remote islands and natural wonders, here are our top 100: THE STRIKING HAIFOSS WATERFALL IN ICELAND IS ONLY ACCESSIBLE TO COMMITTED HIKERS AND 4X4 VEHICLES, WHICH KEEPS THE 122-METER-TALL CASCADE UNDER-THE-RADAR. Moyan Brenn / Flickr DIP INTO ONE OF THE STUNNING TERRACED THERMAL POOLS FILLED WITH MINERALS IN PAMUKKALE, TURKEY. muratart/Shutterstock VISIT SETENIL DE LAS BODEGAS, A VILLAGE IN ANDALUCIA, SPAIN, THAT WAS BUILT INTO CLIFFS AND WHERE RESIDENTS' HOUSES HAVE LARGE ROCKS COVERING THEM INSTEAD OF ROOFS. Migel/Shutterstock SEE THE REST OF THE STORY AT BUSINESS INSIDER