Different from anything else in Estonia, Rummu is a geological wonder with its unique combination of flooded quarries, sinkholes, & underground caverns. Visitors are rewarded with an eye-opening and humbled visual feast of breathtaking natural beauty as teen pattlthey explore this unusual landscape. In addition to serving as a potent reminder of the need to save these natural treasures for future generations, Rummu's geology provides insight into the amazing forces that have shaped our planet over millions of years. The abandoned prison complex, which serves as a sobering reminder of Estonia's turbulent past, is one of the most eerie and haunting sights in Rummu. The Soviet Union constructed the jail in the 1940s, housing both criminals and political prisoners.